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利用沙培方法研究了乙烯对磷胁迫下大豆幼苗的生理影响。结果表明:磷胁迫下大豆主根长度降低50%,侧根长度增加46%,侧根数目增加64%。缺磷时大豆根系磷含量降低,根系活力和根系组织酸性磷酸酶活性分别是全磷培养植株的1.2和1.3倍;与供磷植株相比,缺磷时大豆干物质累积量显著降低,缺磷主要抑制了地上部分干物质累积,而根系干物质累积几乎不变,根冠比增大。磷胁迫使大豆乙烯含量增加,但乙烯释放量被乙烯拮抗剂Co2+抑制。外源乙烯利抑制全磷大豆主根伸长,促进缺磷大豆侧根生长;乙烯拮抗剂Co2+逆转了低磷和乙烯对主根的抑制,减少侧根数目。乙烯利能够增加大豆幼苗根系活力和根系组织酸性磷酸酶活性,降低大豆生物量,增加根冠比,且磷胁迫时效果更为明显。
Physiological effects of ethylene on soybean seedlings under phosphorus stress were studied using sand culture method. The results showed that under the phosphorus stress, the length of main roots decreased by 50%, the length of lateral roots increased by 46% and the number of lateral roots increased by 64%. Phosphorus content of soybean root decreased and root activity and acid phosphatase activity of root tissue were 1.2 and 1.3 times of that of total phosphorus plant when phosphorus deficiency, respectively. Compared with phosphorus supply plant, accumulation of soybean dry matter in phosphorus deficiency plant decreased significantly, Mainly inhibited the accumulation of dry matter above the ground, while the root dry matter accumulation almost unchanged, root-shoot ratio increased. Phosphorus stress increased ethylene content in soybean, but ethylene release was inhibited by ethylene antagonist Co2 +. Exogenous ethephon inhibited the elongation of main roots of all-P soybean, and promoted the growth of lateral roots lacking phosphorus. The ethylene antagonist Co2 + reversed the inhibition of main roots by low phosphorus and ethylene and reduced the number of lateral roots. Ethephon could increase root activity and acid phosphatase activity of soybean seedlings, reduce soybean biomass, increase root / shoot ratio, and the effect was more obvious under phosphorus stress.