Evaluaci車n de dos generaciones de h赤bridos y progenitores de sorgo tolerantes al fr赤o. I: variabilidad gen谷tica y adaptabilidad

作者：Leon Velasco; Humberto; Mendoza Onofre; Leopoldo E; Castillo Gonzalez; Fernando; Cervantes Santana; Tarcicio; Martinez Garza; angel

来源：Agrociencia, 2009.

• sorghum bicolor l. moench
• hybrids
• parental lines
• cold tolerance.

in 1990, the first generation of cold tolerant experimental sorghum [sorghum bicolor (l.) moench] hybrids adapted to the mexican high central valleys was evaluated, and in 1995, the second generation of hybrids was developed, with new b-and r- lines. with the purpose of evaluating genetic variability and adaptability of the two generations of hybrids and parental lines for grain yield and other traits, five experiments (three irrigated and two under rain fed conditions) were set up in 1996, in contrasting environments at 2250 m of altitude. each experiment included 12 hybrids from the 1st generation, 80 from the 2nd, their corresponding parental lines and four testers, in an 11x11 square lattice with four repetitions. the experimental plot had two rows (3 m long, 0.7 wide) with one plant each 10 cm. the 2nd generation hybrids had earlier flowering, greater yield and better agronomic characteristics than those from the 1st generation and the cv. va-110 (the best tester). the 2nd generation r- lines had earlier flowering and higher yields than those from the 1st; the 2nd generation b- lines, with yields that were statistically similar, had earlier flowering than those of the 1st and va-110. the average yield of the ten top 2nd generation hybrids was 7.97 t ha-1 in the irrigated experiments and 2.49 t ha-1 under rain fed. in the 1st generation, the r- lines were stable for yield and hybrids were for early flowering; the r-lines and the hybrids of the 2nd generation showed a stable and desirable yield.

• 出版日期2009