Effects of Drought Stress on Chlorophyll Fluorescence in Tomato
College of Horticulture and Landscape, Northeast Agricultural University, Harbin, China
Molecular Plant Breeding, 2017, Vol. 8, No. 7 doi: 10.5376/mpb.2017.08.0007
Received: 18 Sep., 2017 Accepted: 26 Sep., 2017 Published: 30 Sep., 2017
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Preferred citation for this article:
Zhang J., Liu J.F., Zhao T.T., and Xu X.Y., 2017, Effects of drought stress on chlorophyll fluorescence in tomato, Molecular Plant Breeding, 8(7): 65-69 (doi: 10.5376/mpb.2017.08.0007)
Drought stress is one of the most important abiotic stresses, which greatly influences the photosynthesis of plants. The present study aimed to determine effects of drought stress to chlorophyll fluorescence parameters on tomato seedlings. In this paper, tomato seedlings were treated for 3, 6, 12 or 24 h by polyethylene glycol 6000 (PEG 6000) to simulate the drought stress. The effects of drought stress on chlorophyll fluorescence characteristics of tomato leaves and the characteristics of chlorophyll fluorescence parameters were analyzed by IMAGING-PAM modulated chlorophyll fluorescence in order to provide theoretical basis for tomato cultivation and breeding. The results showed that 1) the FM value of tomato seedlings after drought treatment was significantly lower than that without drought treatment about declined by 9.7%. 2) The value of Y (II) initially increased slightly and then decline eventually leveling off trend with the increasing of drought treatment time. 3) The ETR value was lower under drought stress than control check, especially when the drought stress treatment time up to 6 to 12 hours, the ETR value drops sharply, then increased slightly. 4) qP decreased from 0.646 to 0.4013 under the drought stress, which reflects the ability of oxidation of QA weakened, namely electron transfer activity of PS II decreased. 5) 15% PEG 6000 simulated drought stress treatment induced qN increased significantly.
Tomato; Drought stress; Chlorophyll fluorescence; Photosynthesis