锌肥对干旱下冬小麦产量形成及籽粒锌积累动态的影响

干旱胁迫是造成冬小麦减产的主要原因之一,为探寻干旱防御技术,本研究以豫农211为材料,在拔节期、灌浆期对小麦进行不同水分和锌肥处理,研究了施用锌肥对干旱条件下冬小麦SPAD值、叶片相对含水率、地上部干物质积累、籽粒灌浆速率、籽粒锌积累动态及产量形成的影响。结果表明,干旱胁迫下,冬小麦叶片SPAD值、叶片相对含水率、单株地上部干物质积累、籽粒灌浆速率、籽粒锌积累速率、产量及其构成因素均显著下降,施用适量锌肥可以提高小麦叶片含叶绿素量,增加叶片相对含水率及单株干物质总量,提高籽粒灌浆速率,促进籽粒锌积累速度及最终籽粒含锌量,提高产量。本试验条件下,锌肥能增加干旱下小麦产量4.80%,籽粒含锌量36.86%。

The Impact of Zinc Fertilizer on Yield and Accumulation of Zinc in Grain of Winter Wheat under Drought Stress

Drought is one of main abiotic stresses limiting wheat production.In this paper,we investigated the feasibility of using zinc fertilizer to alleviate the impact of drought on growth and yield of the wheat.The cultivar Yunong211 was used as the model plant,and the effect of zinc fertilizer on SPAD value,leaf water content,dry matter accumulation,filling rate,accumulation of zinc in grain,as well as the yield was examined under different drought stresses.The results showed that drought significantly reduced the chlorophyll content in leaves,leaf water content,dry matter accumulation,filling rate,accumulation of zinc in grain and the yield.Applying adequate zinc fertilizer improved the chlorophyll content in the leaves,total plant dry matter,grain filling rate,zinc accumulation in grain,and yield.In our experiments,applying zinc fertilizer increased yield and zinc content in the grain by 4.80％ and 36.86％,respectively,when the plant was subjected to drought stress.