Effects of conservation tillage on photosynthetic characteristics andprotective enzyme activity of Isatis indigotica

Abstract

Abstract: Effects of different tillage practices, i.e. T, NT and NTS, on photosynthetic characteristics, WUE, chlorophyll content and protective enzyme activity of Isatis indigotica were studied in different months. Diurnal change of Pn was a typical bimodal curve in different months, the diurnal average and annual average of Pn displayed NTS＞NT＞T. Gs had a flood tide in the morning,then falled to a low level fluctuation. The diurnal average and annual average of Gs displayed NTS＞NT＞T too.WUE diurnal change was similar to Gs, had no correlation to Pn. WUE diurnal average were NTS＞NT＞T in June and August,but T＞NT＞NTS in October,and WUE annual average were NTS＞NT＞T.It indicated that conservation tillage could storage water in soil,especially NTS.And in growing later season, moderate drought was propitious to improve WUE.Ci and Pn diurnal variation showed a marked negative correlation, it indicated that Pn lunch break due to stomatal limitation. Tr diurnal change was a typical bimodal curve in different months,and showed significant positive correlation with Pn. The diurnal average and annual average of Tr were NTS＞NT＞T also.Conservation tillage improved Chla and Chl(a+b) content significantly, and all the annual average of Chla, Chlb, Chl(a+b) and Chla/Chlb were NTS>NT>T. NT and NTS delayed Chla degradation,then enhanced Pn, NTS had the best effect of all. Conservation tillage improved CAT activity markedly in dry months of June and October,and improved SOD activity of NTS markedly in higher temperature.Because of SOD, POD and CAT coordinated protection,cellmembrane lipid peroxidation injury was reduced significantly.MDA annual average was T>NT>NTS.It illustrated that protective enzyme activity enhancing under NTS and NT,especially NTS,made a good physiological basis to Pn boost and normal growth of I. indigotica.

CLC Number:

S344
Q945.11

YANG Jiang-shan, ZHANG En-he, HUANG Gao-bao, ZHANG Ren-zhi. Effects of conservation tillage on photosynthetic characteristics andprotective enzyme activity of Isatis indigotica[J]. Acta Prataculturae Sinica, 2010, 19(1): 113-120.

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