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在池栽条件下,以美棉33B为材料,研究花铃期干旱、渍水7 d和渍水14 d处理对棉铃碳水化合物含量的影响及其与生物量累积的关系.结果表明:干旱处理对下部果枝棉铃铃壳碳水化合物含量的影响较小,降低了中部铃壳碳水化合物含量;干旱处理上部铃壳和渍水处理铃壳可溶性糖、淀粉含量增加,蔗糖含量先降后增,且随渍水持续期延长变幅增大,蔗糖外运受阻加重.与铃壳相比,花铃期干旱和渍水处理对棉籽碳水化合物含量的影响较小.干旱和渍水7 d处理中部果枝棉铃生物量快速增长起始期提前但历时短,下部和上部棉铃生物量累积最大增长速率降低;渍水14 d处理不同果枝部位棉铃生物量累积最大增长速率均降低.相关分析表明,棉铃生物量及其最大增长速率与铃壳可溶性糖和蔗糖含量关系密切.因此,花铃期干旱和渍水影响棉铃蔗糖外运,改变棉铃生物量累积特性,是棉铃生物量降低的原因.
Under the condition of pool planting, the effects of drought, waterlogging and waterlogging on the carbohydrate content of cotton bollworm and its relationship with biomass accumulation were studied using meibang 33B as material.The results showed that: The content of carbohydrate in boll shell of lower fruit branch was less affected, which reduced the content of carbohydrate in the shell of middle boll shell. The content of soluble sugar and starch in the upper shell and waterlogging seedling increased with the increase of the content of sucrose The duration of waterlogging increased and the increase of exogenous sucrose was hindered. The drought and waterlogging had less effect on the carbohydrate content of cottonseed during flowering and boll irrigation periods compared with boll shell. The rapid growth of biomass started early but with a short duration, and the maximum growth rate of biomass accumulation in lower and upper boll decreased. The maximum growth rate of boll accumulation in different fruiting branches of 14 d after waterlogging decreased, and the correlation analysis showed that the biomass and its The maximum growth rate was closely related to the content of soluble sugar and sucrose in bolls, therefore, the drought and waterlogging in flowering and bollwill affected the transport of sucrose in cotton boll and changed the accumulation characteristics of cotton bolls, The reason for the decrease in biomass.