高粱不同组织浸提液对小麦幼苗的化感作用

为了给小麦合理轮作倒茬提供参考依据,研究了高粱不同组织的水浸提液对小麦幼苗生长的化感作用.结果表明,高粱秆、穗、叶的水浸提液对小麦幼苗的苗高和根长均有极强的化感作用,浸提液在低浓度时促进小麦生长,高浓度抑制小麦生长,且对根的化感作用大于对地上部的化感作用.高浓度高粱浸提液降低了小麦的根系活力和叶片可溶性蛋白含量,提高了小麦叶片的丙二醛(MDA)含量;小麦叶片的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)等酶活性均显著下降.综合来看,高粱不同组织水浸提液对小麦的化感作用表现为秆＞穗＞叶.

Allelopathic Effect of Aqueous Extract of Different Organs of Sorghum on Seedling Growth of Wheat

Seedlings of wheat were used as the receptor plants to study the allelopathic effects of Sorghum using aqueous extracts from different organs at different concentrations. The results showed that the Sorghum had strong allelopathic effects on the growth of seedling and roots of wheat,which presented promotion effects in low concentration and inhibition in high concentration. The root growth of wheat was significantly inhibited,compared to seedling growth of wheat. The physiological parameters of wheat studied in the high concentration of water extract indicated that the water extract of Sorghum inhibited the vigor of the plant roots,decreased the concentration of soluble protein,but increased the content of MDA. At the same time,it was found that water extracts of Sorghum reduced the activities of hyperoxide dismutase(SOD),catalase(CAT) and peroxide enzyme(POD). As to the synthetic inhibiting effects(SE),the allelopathic inhibition of Sorghum stem extracts was stronger than that of spike,and the effect of leaf extracts was the weakest.