玉米种子萌发能力和耐脱水能力的形成

Formation of Desiccation Tolerance and Germinabillty during Development of Zea mays L. Seeds

摘要:

以玉米品种“粤单9117”为材料,研究了种子发育过程中萌发能力和耐脱水能力的获得。玉米种子的生理成熟期约为42 DAP（授粉后天数）。胚萌发能力的获得是在14-21 DAP、耐脱水能力的获得出现在25-28 DAP。胚的耐脱水能力在28 DAP后仍不断得到加强。耐脱水能力的获得与细胞膜的发育及受保护的程度密切相关。脱水有利于不同发育时期的胚和种子的萌发。

Abstract:

The seeds and embryos of Zea mays L. cv. Yuedan 9117 were used to determine the acquisition of desiccation tolerance and germinability during maize seed development. Physiological maturity of seeds was at 42 days after pollination (DAP). The embryos obtained germinability during 14-21 DAP, and the desiccation tolerance of embryos was obtained during 25-28 DAP, desiccation tolerance still being strengthened after 28 DAP. The changes in electrolyte leakage rate of seeds and embryos during development of maize seeds might suggest that there was a close relationship among desiccation tolerance，membran e development， and protection of membrane injury．Desiccation is beneficial to germ ination of seeds and embryos during the development of maize．