Effect of different drought-re watering modes on growth and yield of Tartary buckwheat
In order to explore the effects of different drought-rewatering treatments on the growth and yield of Tartary buckwheat[Fagopyrum tataricum(L.)Gaertn.],buckwheat variety Jinqiao 2 was used as the test material,set up five drought-rewatering treatments were set up,which were CK(soil water potential maintained at-20--30 kPa),LD(soil water potential maintained at-40--50 kPa),HD(soil water potential maintained at-60--70 kPa)and L0(when soil water potential was-40--50 kPa,restore it to-20--30 kPa),H0(restore it to-20--30 kPa when the soil water potential was-60--70 kPa).Agronomic traits,root morphology,antioxidant enzyme ac-tivity,photosynthetic characteristics and yield of Tartary buckwheat under different drought-rehydration modes were determined.The results showed that the agronomic traits of Tartary buckwheat increased first and then decreased with the decrease of soil water potential,which reached the maximum in LD treatment and the minimum in HD treatment.With the advancement of buckwheat fertility,the root morphology,activity of antioxidant enzymes in leaves,and photosynthetic characteristics of buckwheat after different drought-rehydration treatments showed a trend of first in-creasing and then decreasing;Compared with CK,LD treatment significantly increased the buckwheat root morpholo-gy indicators,HD,L0 and H0 treatments had a tendency to significantly reduce the buckwheat root morphology indi-cators,the root morphology indicators under all treatments had reached the maximum in the LD treatment,the mini-mum in the HD treatment;Compared with CK,LD treatment promoted the increase of SOD,POD and CAT activi-ties,net photosynthetic rate,and stomatal conductance in buckwheat leaves,while HD,L0,and H0 treatments de-creased the activities of antioxidant enzymes,net photosynthetic rate,and stomatal conductance in buckwheat leaves.The yield of buckwheat in LD treatment was the highest,which were 1.22,2.17,1.81 and 1.63 times higher than that of CK,HD,L0 and H0 treatments,respectively.In summary,LD treatment could promote the growth of buck-wheat underground and aboveground,increase photosynthetic utilization,enhance the antioxidant activity,increase grain weight,to achieve the effect of water saving and yield increase.
Tartary buckwheatdrought stressroot morphologygrowth and developmentyield
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