论文部分内容阅读
选用35个玉米品种(农家种4个,双交种4个,单交种27个),在海南三亚设置正常浇水和花期干旱两个处理,鉴定每个品种在干旱环境下的保绿性,比较不同年代品种的持绿性。结果发现,干旱导致玉米叶片叶绿素含量下降,衰老启动时间提前,干旱条件下品种的衰老启动时间、最大衰老速度出现时间均随年代更替而延后,最大衰老速度均随着年代更替而下降,即玉米的保绿性均随着年代更替而提高,与正常浇水条件下的趋势相似。玉米保绿性与叶绿素含量均与产量呈显著相关;在干旱处理条件下,品种保绿性均随年代更替而提高,我国的玉米育种中已经对持绿性进行了改良,耐旱性也得到提高。
A total of 35 maize varieties (4 for peasant families, 4 for double cross breeds and 27 for single cross breeds) were selected. Two treatments, normal watering and florescence drought, were set up in Sanya, Hainan Province to identify the greenness of each variety under drought conditions , Comparing different generations of green varieties. The results showed that drought led to the decline of chlorophyll content in maize leaves, earlier start of senescence, the onset time of senescence and the onset time of maximum senescence of varieties under drought condition were delayed with age, and the maximum senescence rate decreased with the change of seasons, that is Green retention of maize increased with age, similar to the trend under normal watering conditions. Green protection and chlorophyll content of maize were significantly correlated with the yield. Under the condition of drought treatment, the variety of green protection increased with the change of age. Maize breeding in China had been improved in greening and drought tolerance was also obtained improve.