F1 hybrids and recombinant inbred lines in rice
The development of F1 hybrids or inbred lines is a dilemma faced by many rice breeders. Rice F1 hybrids have an average yield advantage of about 15% over the best inbred cultivars but they have some disadvantages. Firstly, they do not breed true and they lose the yield advantage in subsequent generations. Secondly, they are more susceptible than inbred lines to the major diseases and insect pests. Thirdly, their seed production cost is 10-15 times higher than that of ordinary seeds and finally they are generally inferior to the best conventional cultivars in the main quality traits such as grain size, vitreosity, milling yield. Results obtained when F1 rice hybrids were compared with recombinant inbred lines led to the conclusion that application of combined selection for yield and quality could produce recombinant inbred lines with equal yielding ability and equal or higher quality than the F1 hybrids. Similar results were obtained in other self-pollinated crops such as tomato, Nicotiana rustica, barley and cotton. F1 hybrids should hardly be seen as finished forms of cultivars. They should mainly serve as bridges to develop the most advanced forms, i.e., pure line cultivars. It is concluded that in the developed world F1 rice hybrids are not justified to be a breeding goal but just an intermediate step for breeding of even better inbred cultivars. In contrast, in the developing world the release of F1 rice hybrids is justified and they can play a significant role until their seed production cost and quality will become limiting factors.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
CIRAD
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| Subjects: | F30 - Génétique et amélioration des plantes, Oryza, hybride, recombinaison, caractère agronomique, méthode d'amélioration génétique, http://aims.fao.org/aos/agrovoc/c_5435, http://aims.fao.org/aos/agrovoc/c_3707, http://aims.fao.org/aos/agrovoc/c_6475, http://aims.fao.org/aos/agrovoc/c_210, http://aims.fao.org/aos/agrovoc/c_1079, |
| Online Access: | http://agritrop.cirad.fr/510159/ |
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