水分胁迫对棉花光合产物在下部“铃-叶系统”中运转分配的影响

Effects of water stress on translocation and distribution of the (14)~C-photosynthates of lower"boll-leaf system"in cotton

为了解棉花叶片光合产物在干旱环境下的运转分配规律,在防雨棚中设置不同水分条件对棉花进行了研究。通过利用^(14)CO_2在棉花的盛蕾期、盛花期对棉花下部主茎叶片进行饲喂,研究在严重胁迫(SS)、中度胁迫(MS)、以及对照(CK)3个不同水分处理环境下^(14)C光合产物在棉株下部"铃-叶系统"中的运转与分配特征。结果表明,随着水分亏缺程度的加重,^(14)C光合产物在标记叶中滞留量增加,向外输出量减少;所产生的光合产物向幼铃和根部输送的比率增加,向成铃与主茎生长点的分配比率下降。对纤维品质的测定结果表明,在棉花生长的前期,适当的干旱胁迫不会对纤维品质造成显著的影响。

To understand the translocation and distribution regularity of photosynthates stress, an experiment was performed under a water proof canopy with different levels of and distribution of ^14CO2 photosynthates on low part ＂boll-leaf system＂ were studied by leaf at full-bud and florescence stages. The results showed that, with the increasing level in cotton leaves under drought soil moisture. The translocation feeding ^14CO2 to low main stem of water deficit, the quantity of detained ^14C- photosynthates in the mark leaf were increased while the export were decreased; ^14C - photosynthates in immature boll and roots increased but they declined in the mature boll and the growing point of main stem. In addition, the results of the fiber quality showed that suitable water stress did not have a remarkable influence on the fiber quality at early growing stages of cotton.