Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ?
Specific leaf area (SLA), defined as the ratio between leaf blade area and its dry weight, determines the physiological cost of producing leaf area. Theoretically, at a given pattern of assimilate partitioning among plant organs, varieties having high SLA should produce a leaf area more rapidly than those having low SLA, or thick leaves. This is because the reduction in leaf photosynthesis caused by high SLA is more than offset by the gain in light interception during exponential growth. The same reasoning would call for higher relative growth rates (RGR) during exponential growth for varieties having high SLA. According to studies in 1986-90 at the International Rice Research Institute, RGR is correlated with tillering. One can therefore argue that SLA is physiologically linked with tillering ability. Studies at the West Africa Rice Development Association in 1995-98 indicated a positive correlation across genotypes between SLA and tillering ability, leaf area index (LAI), and weed competitiveness. The study used diverse genotypes, including traditional and improved Oryza sativa indica (lowland-adapted) and japonica (upland) types, as well as O. glaberrima landraces and interspecific crosses. A subset of these materials showed that varietal differences in SLA were already expressed before the plant became autotrophic and were carried through to the flowering stage. Recent studies at the Centre de coopération internationale en recherche agronomique pour le développement disaggregated the components of leaf area development, such as tiller and leaf appearance rate and genealogy, as well as leaf extension rates and final dimensions for an O. sativa indica (high tillering, small leaves), an O. sativa japonica (low tillering, large leaves), and an O. glaberrima cultivar (high tillering, intermediate leaves). For all cultivars, a common linear relationship was observed between relative tillering rate (RTR) and RGR. This relationship was quite robust across development stages, except the reproductive stage, and across different levels of temperature and drought. Differential tillering rates and leaf area development among varieties and environments were therefore related to dry matter acquisition, based on a common relationship for morphologically and phenologically different materials.We conclude that there is a strong case for SLA being responsible to a large extent for varietal differences in tillering ability and LAI in rice. Varietal differences in tillering ability may in fact be due to inherent growth ability. High SLA (thin leaves) is a major factor enabling early ground cover and light interception; therefore, it determines potential growth in many situations. Once ground cover is complete, however, high SLA becomes disadvantageous because leaf photosynthetic rates then limit growth. Consequently, the most efficient plant type in terms of growth would have high SLA during early growth stages and low SLA for leaves produced later on. Such a plant type would have high and early tillering. This reasoning, if accurate, has far-reaching consequences for plant-type concepts and selection criteria because selection for low-tillering types would most likely favor low-SLA types, associated with poor vegetative growth vigor and weed competitiveness. The new plant type is discussed in the light of these results.
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Subjects: | F62 - Physiologie végétale - Croissance et développement, F30 - Génétique et amélioration des plantes, F50 - Anatomie et morphologie des plantes, Oryza sativa, Oryza glaberrima, morphogénèse, surface foliaire, croissance, facteur de rendement, tallage, performance de culture, indice de surface foliaire, http://aims.fao.org/aos/agrovoc/c_5438, http://aims.fao.org/aos/agrovoc/c_5436, http://aims.fao.org/aos/agrovoc/c_4943, http://aims.fao.org/aos/agrovoc/c_16110, http://aims.fao.org/aos/agrovoc/c_3394, http://aims.fao.org/aos/agrovoc/c_16091, http://aims.fao.org/aos/agrovoc/c_7773, http://aims.fao.org/aos/agrovoc/c_35199, http://aims.fao.org/aos/agrovoc/c_35196, http://aims.fao.org/aos/agrovoc/c_5783, |
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F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 http://aims.fao.org/aos/agrovoc/c_5783 F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 http://aims.fao.org/aos/agrovoc/c_5783 |
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F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 http://aims.fao.org/aos/agrovoc/c_5783 F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 http://aims.fao.org/aos/agrovoc/c_5783 Dingkuhn, Michaël Tivet, Florent Siband, Pierre-Lucien Asch, Folkard Audebert, Alain Sow, A. Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
description |
Specific leaf area (SLA), defined as the ratio between leaf blade area and its dry weight, determines the physiological cost of producing leaf area. Theoretically, at a given pattern of assimilate partitioning among plant organs, varieties having high SLA should produce a leaf area more rapidly than those having low SLA, or thick leaves. This is because the reduction in leaf photosynthesis caused by high SLA is more than offset by the gain in light interception during exponential growth. The same reasoning would call for higher relative growth rates (RGR) during exponential growth for varieties having high SLA. According to studies in 1986-90 at the International Rice Research Institute, RGR is correlated with tillering. One can therefore argue that SLA is physiologically linked with tillering ability. Studies at the West Africa Rice Development Association in 1995-98 indicated a positive correlation across genotypes between SLA and tillering ability, leaf area index (LAI), and weed competitiveness. The study used diverse genotypes, including traditional and improved Oryza sativa indica (lowland-adapted) and japonica (upland) types, as well as O. glaberrima landraces and interspecific crosses. A subset of these materials showed that varietal differences in SLA were already expressed before the plant became autotrophic and were carried through to the flowering stage. Recent studies at the Centre de coopération internationale en recherche agronomique pour le développement disaggregated the components of leaf area development, such as tiller and leaf appearance rate and genealogy, as well as leaf extension rates and final dimensions for an O. sativa indica (high tillering, small leaves), an O. sativa japonica (low tillering, large leaves), and an O. glaberrima cultivar (high tillering, intermediate leaves). For all cultivars, a common linear relationship was observed between relative tillering rate (RTR) and RGR. This relationship was quite robust across development stages, except the reproductive stage, and across different levels of temperature and drought. Differential tillering rates and leaf area development among varieties and environments were therefore related to dry matter acquisition, based on a common relationship for morphologically and phenologically different materials.We conclude that there is a strong case for SLA being responsible to a large extent for varietal differences in tillering ability and LAI in rice. Varietal differences in tillering ability may in fact be due to inherent growth ability. High SLA (thin leaves) is a major factor enabling early ground cover and light interception; therefore, it determines potential growth in many situations. Once ground cover is complete, however, high SLA becomes disadvantageous because leaf photosynthetic rates then limit growth. Consequently, the most efficient plant type in terms of growth would have high SLA during early growth stages and low SLA for leaves produced later on. Such a plant type would have high and early tillering. This reasoning, if accurate, has far-reaching consequences for plant-type concepts and selection criteria because selection for low-tillering types would most likely favor low-SLA types, associated with poor vegetative growth vigor and weed competitiveness. The new plant type is discussed in the light of these results. |
format |
conference_item |
topic_facet |
F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 http://aims.fao.org/aos/agrovoc/c_5783 |
author |
Dingkuhn, Michaël Tivet, Florent Siband, Pierre-Lucien Asch, Folkard Audebert, Alain Sow, A. |
author_facet |
Dingkuhn, Michaël Tivet, Florent Siband, Pierre-Lucien Asch, Folkard Audebert, Alain Sow, A. |
author_sort |
Dingkuhn, Michaël |
title |
Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
title_short |
Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
title_full |
Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
title_fullStr |
Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
title_full_unstemmed |
Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
title_sort |
varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? |
publisher |
IRRI |
url |
http://agritrop.cirad.fr/481838/ |
work_keys_str_mv |
AT dingkuhnmichael varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor AT tivetflorent varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor AT sibandpierrelucien varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor AT aschfolkard varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor AT audebertalain varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor AT sowa varietaldifferencesinspecificleafareaacommonphysiologicaldeterminantoftilleringabilityandearlygrowthvigor |
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1792494972224667648 |
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dig-cirad-fr-4818382024-01-28T09:23:39Z http://agritrop.cirad.fr/481838/ http://agritrop.cirad.fr/481838/ Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? Dingkuhn Michaël, Tivet Florent, Siband Pierre-Lucien, Asch Folkard, Audebert Alain, Sow A.. 2001. In : Rice research for food security and poverty alleviation. Peng S. (ed.), Hardy Bill (ed.). IRRI. Metro Manila : IRRI, 95-108. ISBN 971-220-157-0 International Rice Research Conference, Los Banos, Philippines, 31 Mars 2000/3 Avril 2000. Varietal differences in specific leaf area: a common physiological determinant of tillering ability and early growth vigor ? Dingkuhn, Michaël Tivet, Florent Siband, Pierre-Lucien Asch, Folkard Audebert, Alain Sow, A. eng 2001 IRRI Rice research for food security and poverty alleviation F62 - Physiologie végétale - Croissance et développement F30 - Génétique et amélioration des plantes F50 - Anatomie et morphologie des plantes Oryza sativa Oryza glaberrima morphogénèse surface foliaire croissance facteur de rendement tallage performance de culture indice de surface foliaire http://aims.fao.org/aos/agrovoc/c_5438 http://aims.fao.org/aos/agrovoc/c_5436 http://aims.fao.org/aos/agrovoc/c_4943 http://aims.fao.org/aos/agrovoc/c_16110 http://aims.fao.org/aos/agrovoc/c_3394 http://aims.fao.org/aos/agrovoc/c_16091 http://aims.fao.org/aos/agrovoc/c_7773 http://aims.fao.org/aos/agrovoc/c_35199 http://aims.fao.org/aos/agrovoc/c_35196 Philippines http://aims.fao.org/aos/agrovoc/c_5783 Specific leaf area (SLA), defined as the ratio between leaf blade area and its dry weight, determines the physiological cost of producing leaf area. Theoretically, at a given pattern of assimilate partitioning among plant organs, varieties having high SLA should produce a leaf area more rapidly than those having low SLA, or thick leaves. This is because the reduction in leaf photosynthesis caused by high SLA is more than offset by the gain in light interception during exponential growth. The same reasoning would call for higher relative growth rates (RGR) during exponential growth for varieties having high SLA. According to studies in 1986-90 at the International Rice Research Institute, RGR is correlated with tillering. One can therefore argue that SLA is physiologically linked with tillering ability. Studies at the West Africa Rice Development Association in 1995-98 indicated a positive correlation across genotypes between SLA and tillering ability, leaf area index (LAI), and weed competitiveness. The study used diverse genotypes, including traditional and improved Oryza sativa indica (lowland-adapted) and japonica (upland) types, as well as O. glaberrima landraces and interspecific crosses. A subset of these materials showed that varietal differences in SLA were already expressed before the plant became autotrophic and were carried through to the flowering stage. Recent studies at the Centre de coopération internationale en recherche agronomique pour le développement disaggregated the components of leaf area development, such as tiller and leaf appearance rate and genealogy, as well as leaf extension rates and final dimensions for an O. sativa indica (high tillering, small leaves), an O. sativa japonica (low tillering, large leaves), and an O. glaberrima cultivar (high tillering, intermediate leaves). For all cultivars, a common linear relationship was observed between relative tillering rate (RTR) and RGR. This relationship was quite robust across development stages, except the reproductive stage, and across different levels of temperature and drought. Differential tillering rates and leaf area development among varieties and environments were therefore related to dry matter acquisition, based on a common relationship for morphologically and phenologically different materials.We conclude that there is a strong case for SLA being responsible to a large extent for varietal differences in tillering ability and LAI in rice. Varietal differences in tillering ability may in fact be due to inherent growth ability. High SLA (thin leaves) is a major factor enabling early ground cover and light interception; therefore, it determines potential growth in many situations. Once ground cover is complete, however, high SLA becomes disadvantageous because leaf photosynthetic rates then limit growth. Consequently, the most efficient plant type in terms of growth would have high SLA during early growth stages and low SLA for leaves produced later on. Such a plant type would have high and early tillering. This reasoning, if accurate, has far-reaching consequences for plant-type concepts and selection criteria because selection for low-tillering types would most likely favor low-SLA types, associated with poor vegetative growth vigor and weed competitiveness. The new plant type is discussed in the light of these results. conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/closedAccess http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=166375 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=170979 |