黄腐植酸浸种对杂草稻胁迫下栽培稻生理功能的调控

Regulation of Fulvic Acid Soaking on Physiological Function of Cultivated Rice under Weedy Rice Stress

以杂草稻JS-Y1和栽培稻南粳44为材料,采用田间试验,研究了不同浓度黄腐植酸（Fulvic Acid,FA）（0、4、6、8 g/L）浸种对不同密度杂草稻（0、4、8株/m2）胁迫下栽培稻光合性能、根系活力及产量的影响。结果表明：与对照相比,杂草稻胁迫不同程度抑制了栽培稻不同生育期生理指标,影响栽培稻正常的生理功能,对不同发育期栽培稻叶绿素含量、干物重、净光合速率、根系活力、根系伤流液等抑制率分别达5.61%、24.91%、18.00%、25.23%、20.51%,最终导致栽培稻产量下降10.02%~23.06%。而黄腐植酸浸种处理明显提高了栽培稻光合性能、根系活力等,改善了杂草稻胁迫下栽培稻生理功能,降低了杂草稻对栽培稻产量的不利影响,说明黄腐植酸浸种处理经栽培稻-杂草稻相互生态关系的调控,能提高栽培稻对杂草稻的竞争能力,降低杂草稻对栽培稻生长发育的不利影响。

In this paper,taken weedy rice‘JS-Y1＇and rice cultivar‘Nanjing 44＇as tested materials,the field experiments were conducted to study the effects of fulvic acid（ FA） soaking rice seeds with different concentrations（ FA concentrations 0,4,6,8 g / L） on the photosynthetic performance,root activity and yield components of cultivated rice under the stress of weedy rice with different densities（ 0,4,8 plants /m2）. The results showed that the weed suppressed the physiological stress indicators of cultivated rice in varying degrees at different growth stages comparing with the control,and weedy rice affected the normal physiological functions of cultivated rice at the different developmental stages. The inhibition rates of SPAD,dry weight,net photosynthetic rate,root system oxidizing power and root sap bleeding reached to 5. 61%,24. 91 %,18. 00 %,25. 23 %,20. 52 %,respectively,which resulted in the decrease of cultivated rice yields by 10. 02 %-23. 06%. The treatment of FA soaking significantly improved the photosynthetic performance and root activity of cultivated rice,enhanced the cultivated rice physiological functions under weedy rice stress and alleviated the adverse effect of weedy rice on cultivated rice. It was concluded that the adverse effects of weedy rice on cultivated rice were decreased by increasing the competitiveness of cultivated rice treated with fulvic acid soaking.