|Author:||Zhang, WangFeng ; Ren, LiTong ; Wang, ZhenLin ; Li,ShaoKun ; Gou, Ling ; Yu, SongLie ; Cao, LianPu|
|Book Group Author:||NA|
The effects of different under-mulch-drip irrigation on the diurnal changes and chlorophyll fluorescence parameters of cotton cultivars Xinluzao6 and Xinluzao8 were investigated in a field experiment in Xinjiang, China, in 2000-02. The treatments were: proper drip irrigation (375 m3/ha); and limited drip irrigation. Results indicated that limited irrigation, which supplies 2/3 of 375 m3/ha caused water deficit in the field. Leaf photosynthetic rate under limited irrigation decreased during 9.00-11.00 h, was significantly suppressed at midday and then recovered. The absorption, transfer and transformation features of solar radiation was evaluated using the chlorophyll fluorescence method. Under limited drip irrigation, the variable fluorescence (Fv) and primary light transfer efficiency of photosystem II (Fv/Fm) in cotton leaves were reduced because of high light intensities and high temperature at noon, and the decrease in Xinluzao was greater than that in Xinluzao6. Results indicate that Xinluzao6 has higher drought tolerance than the other cultivar and that Fv/Fm ratio could be used as a drought resistance index for cotton.
|Pages:||533 - 538|
|Journal:||Agricultural Sciences in China|
chlorophyll, cotton, cultivars, drought resistance,fluorescence, genetic variation, irrigation, leaves, photosynthesis,photosystem II, varietal tolerance, water deficit, water stress, China,Xinjiang, Gossypium, Malvaceae, Malvales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, East Asia, Asia, DevelopingCountries, North Western China, China, carbon assimilation, carbondioxide fixation, Central Asia, cultivated varieties, drought tolerance,genetic variability, genotypic variability, genotypic variation,Sinkiang, watering, Field Crops (FF005) (New March 2000), Plant Breedingand Genetics (FF020), Plant Water Relations (FF062), Plant Production(FF100), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management]