| Effect of drought and rewatering on the photosynthesis and chlorophyll fluorescence of two grape rootstock leaves |
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| DOI：10.7606/j.issn.1000-7601.2019.01.31 |
| Key Words: grape rootstock drought and rewatering photosynthesis chlorophyll fluorescence |
| Author Name | Affiliation | | LI Min-min | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | YUAN Jun-wei | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | HAN Bin | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | LIU Chang-jiang | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | SUN Yan | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | YIN Yong-gang | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | JIA Nan | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | GUO Zi-juan | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China | | ZHAO Sheng-jian | Changli Research Institute of Fruit Trees, Hebei Academy of Agricultural and Forestry Sciences, Changli, Hebei 066600, China |
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| Abstract: |
| In order to better understand the photosynthetic adaptability of two grape rootstocks, 1103P and 101-14M, to drought stress, the effect of continuous drought stress and rewatering on the characteristics of photosynthesis and chlorophyll fluorescence were studied. The 1103P and 101-14M were growing in pots with 40%~45% of soil relative water content (RWC) and at day 21, they were rewatered to raise the soil RWC between 70%~75%. The plants growing in the soil with 70%~75% RWC throughout the growing season were used as control. The parameters of photosynthesis and chlorophyll fluorescence were measured on the 0th, 7th, 14th, and 21st day after drought treatment and on the 7th and 14th day after rewatering. Results showed that continuous drought stress influenced the the net photosynthetic rate (Pn) of 101-14M and 1103P successively decreased in varying degrees, and the decrease of Pn of 101-14M was greater than 1103P. Stomatal limitation play dominant role in decline of photosynthesis in short-term drought stress, non-stomatal limitation was the main reason in decline of photosynthesis while long-term drought stress. As the drought stress continued, the minimal fluorescence (Fo) of 1103P and 101-14M increased, while the increase of 101-14m was greater than 1103P, which indicated that the degree of damage to the photosynthesis organ of 101-14M was higher than 1103P after drought stress. The Pn of 1103P and 101-14M leaves increased gradually after rewatering. At the day 7 after rewatering, 1103P and 101-14M Pn gradually increased to 83.20% and 66.31% of the control. At the 14th day after rewatering, Pn values of 1103P and 101-14M were at 107.30% and 88.43% compared to that of the control. The Fo of 1103P and 101-14M leaves decreased gradually after rewatering. At the 7th day after rewatering, the Fo of 1103P and 101-14M decreased to 102.95% and 109.60% over the control, and the 14th day after rewatering, the Fo of 1103P and 101-14M decreased to 101.56% and 101.81% compared to the control. These results indicated that the damage to the photosynthesis organs could be repaired and reach the same level of Fo of the control after rewatering, and photosynthesis of 1103P leaf had the stronger ability to recover from drought stress than that of 101-14M once the stress was terminated. |
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