DA-6对秋季草莓叶片光合速率和植株生长的影响

Effects of foliar spraying DA-6 on the photosynthetic rate and plant growth of strawberry in autumn.

以‘法国3号’草莓为材料,研究了秋季叶面喷施10、20和30 mg.L-1的DA-6处理对草莓幼苗叶片光合作用、活性氧代谢和植株生长的影响.结果表明:叶面喷施20和30 mg.L-1的DA-6处理使叶片净光合速率分别提高了17.5%和20.6%,并显著提高了叶绿素a、b含量及SOD、CAT酶活性,同时降低了MDA和活性氧含量.20和30 mg.L-1的DA-6处理显著增加了草莓平均单叶干质量,极显著增加了草莓茎和根系干质量,根冠比分别增加了29.9%和29.3%.表明秋季施用一定浓度的DA-6有利于草莓幼苗植株生长.

With strawberry ＇ French 3＇ （ Fragaria × ananassa Duch cv. French 3） as test material, this paper studied the effects of foliar spraying DA-6 at the rates of 10, 20 and 30mg·L^-1 in late autumn on its seedlings net photosynthetic rate, metabolism of reactive oxygen species, and plant growth. Compared with the control, foliar spraying DA-6 of 20 and 30 mg·L^-1 increased the net photosynthetic rate, chlorophyll a and b contents, and SOD and CAT activities significantly, and decreased the reactive oxygen and MDA contents. Moreover, foliar spraying DA-6 of 20 and 30 mg·L^-1 increased the average dry weight per leaf, and the dry mass of shoot and root significantly. The ratio of root to shoot after spraying DA-6 of 20 and 30 mg·L^-1 was 29.9% and 29.3% higher than the control, respectively. Foliar spraying appropriate concentration of DA-6 in late autumn could improve the plant growth of strawberry seedlings.