Abstract: In order to ascertain the difference of chlorophyll fluorescence parameters between rice plant with drip irrigation under plastic film and flooding cultivation.In this study,four rice lines(T-04,T-43,T-66,and T-69) were planted in the field and irrigated by two cultivation patterns:drip irrigation under plastic film mulch and continuous flooding.Then rapid light-response curves of PS Ⅱ chlorophyll fluorescence parameters in leaves were measured at five growth stages,including tillering,booting,heading,milk stage and dough stage.To investigate dynamic changes of chlorophyll fluorescence parameters of rice at different growth stages cultivated by the two patterns,photosynthetic parameters α(light use efficiency), Pm(rETRmax maximum electron transport rate) and Ik(half-saturation intensity) were analyzed.The results showed that most of differences were significant of the photosynthetic parameters in different lines,the same line in different growth stages and with different cultivation patterns.The α,Pm and Ik values of most lines were higher with drip irrigation than with traditional basin irrigation at different growth stages.The α value of T-43,T-66 and T-69,the Pm value of T-04,T-43,T-66 and T-69,the Ik value of T-04,T-66 and T-69 were higher than traditional basin irrigation at tillering stage;The α values of T-04,T-43and T-69,The Pm values of T-04,T-43,T-66 and T-69,the Ik value of T-43,T-66 and T-69 were higher than traditional basin irrigation at booting stage;the α values of T-04,T-43 and T-66,the Pm value of T-04,T-43,T-66 and T-69,the Ik value of T-43,T-66 and T-69 were higher than traditional basin irrigation at heading stage;the α and Pm value of T-43 and T-66,the Ik value of T-04,T-66 and T-69 were higher than traditional basin irrigation at milk stage;the α and Pm value of T-04,T-43,T-66 and T-69,the Ik value of T-43 and T-69 were higher than traditional basin irrigation at dough stage.Results indicated that the light use efficiency in leaf,the maximum capacity of light and light tolerance were higher with drip irrigation under plastic film mulch than those with continuous flooding at different growth stages.It concluded that rice cultivated in this model photosynthetic apparatus of leaves had not been damaged by drought stress,as a new cultivation,it not only guarantee high yield,but also fully improved water use efficiency.

Key words: Rice, Drip irrigation with plastic film mulching, Conventional continuous flooding, Rapid light-response curves

CLC Number: 

• S152.07

• S511.03