Seed production and filling grain index in different ecotypes of three species of Brachiaria genus
The aim of this study was to characterize variability in seed production and quality of three species of the genus Brachiaria, at Isla, Veracruz, México. Twelve Brachiaria brizantha (Trin.) Griseb, nine B. decumbens Stapf. and six B. humidicola (Rendle) Schweick ecotypes were studied. Plots were fertilized with 100 kg ha-1 of N and 50 kg ha-1 of P2O5, in the rainy season. Reproductive tiller density (RTD), crude (CSP) and classified seed yield (CLSY) and seed dormancy were measured. Filling grain index (FGI) and productive efficiency were used as yield indicators. Ecotypes were allocated in a completely randomized block design. Classified seed production of 16549 and 6387 B. brizantha ecotypes was 139 and 151 kg ha-1, respectively. In B. decumbens and B. humidicola the ecotypes 16497 and 6133 with 262 and 345 kg ha-1 of CLSP were the most productive. Commercial controls Insurgente, Chontalpo and Chetumal produced 32, 106 and 21 kg ha-1 of CLSY, respectively. These yields represented 21, 40 and 6 % of CLSY of the best ecotypes within each specie. There was not a direct relationship between CLSY and RTD, hence both are independent characters, which makes FGI a variable attribute in this genus. Seed dormancy did not show significant differences (P>0.05). Reproductive tiller density management in Brachiaria ecotypes with higher FGI, and the use of available genetic diversity are an alternative to increase the classified seed yield.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
2012
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| Online Access: | https://cienciaspecuarias.inifap.gob.mx/index.php/Pecuarias/article/view/1374 |
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