|
|
|
| Effects of Organic Nitrogen Glycine Concentration on Photosynthesis System
and Growth of Hydroponic Pakchoi |
| YANG Dan-ni，WANG Xiao-li，HUANG Dan-feng * |
| （College of Agriculture & Biology， Shanghai Jiao Tong University， Shanghai 200240， China） |
|
|
|
|
Abstract Taking‘ Huawang’ and‘ Wuyueman’ cultivars under sterile hydroponic conditions as
test material，this paper studies the effects of organic nitrogen glycine concentration on photosynthetic
physiology of pakchoi〔Brassica campestirs L. spp. chinensis（L.）Makino var. communis Tsen et
Lee〕. The pakchoi photosynthetic responses to glycine concentration were evaluated by fresh weight，
chlorophyll content，net photosynthetic rate and chlorophyll fluorescence，with 4 concentration
gradients（2.5，5.0，10.0，20.0 mmol·L-1）set up and non-nitrogen as the contrast. The results
showed that fresh weight and leaf photosynthetic pigment contents increased at 0-5 mmol·L-1，but then
decreased over this range. The relatively higher net photosynthetic rate of‘ Huawang’ was observed at
2.5-10.0 mmol·L-1，while that of‘ Wuyueman’ was at 2.5 mmol·L-1．No significant differences of
chlorophyll fluorescence were observed among 4 glycine gradients．Compared to non-nitrogen contrast，
‘Huawang’showed higher Fv/Fm，ΦPSⅡ，qP and lower Fo at every treatment，indicating a higher photochemical efficiency than‘ Wuyueman’.
|
|
Received: 23 April 2013
|
|
|
|
|
|
|
|
|
