夏玉米叶片δ^13C与叶重、水分利用效率及产量的关系研究

The Relationship between δ^(13)C Values of Summer Maize Leaves and Leaf Weight,Water Use Efficiency and Yield

采用LSD法对夏玉米两品种(郑单958和鲁单981)及各水分处理间植株叶片δ13C进行方差分析,并将其与叶重、水分利用效率及产量间关系进行了定性分析,以期为改进旱地和节水农业栽培及选育抗性品种提供参考价值。研究发现:鲁单981较郑单958长势快、株高高、抗倒伏性差,但前者的产量却高于后者;两品种间植株叶片δ13C值差别不明显;不同作物品种相同水分处理间因遗传因素的影响导致其δ13C值有所差异,相同品种不同水分处理间也因环境因素的影响致使其δ13C值有所不同;两品种间植株叶片δ13C值与产量均表现出一致的负相关趋势,但与叶重、水分利用效率却均呈现出相反的相关趋势。其中,在与叶重的相关性中,郑单958表现出正相关性,而鲁单981表现出负相关性;在与水分利用效率的相关性中,郑单958呈负相关趋势,而鲁单981则呈正相关趋势。

In order to supply references to ameliorating dry land, water-saving agricultural cultivation and choosing resistant varieties, the paper analyzed δ^13C variance of two maize varieties （Zhengdan 958 and Ludan 981 ）and water treatments in LSD, and carried on a qualitative analysis on its relationship with leaf weight, water use efficiency and yield. The study found that Ludan 981 had a faster growth, higher plant height and worse lodging resistance than Zhengdan 958,but the yield of the former was higher than the latter. The difference of δ^13C value of leaves between the two variances was not obvious. Different varieties of the same water treatment lead to different δ^13C values as a result of genetic factors,and the same variety of different water treatment resulted in different δ^13C values due to environmental factors. The δ^13C values of the two varieties showed a consistent trend of negative correlation with yield, but a opposite trend with leaf weight and water use efficiency. Among them, with emphasis on the relevance of leaf weight, the Zhengdan 958 showed positive correlation, but Ludan 981 showed negative correlation ; with emphasis on the relevance of water use efficiency, the Zhengdan 958 was a negative correlation trend, but Ludan 981 was a positive correlation trend.