Effects of Physiological Characteristics of Different Tea Cultivars under Drought Treatment and Evaluation on Their Drought Resistance

SHEN Siyan; XU Yanxia; MA Chunlei; CHEN Liang

doi:10.13305/j.cnki.jts.2019.02.006

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Journal of Tea Science ›› 2019, Vol. 39 ›› Issue (2) : 171-180. DOI: 10.13305/j.cnki.jts.2019.02.006

Effects of Physiological Characteristics of Different Tea Cultivars under Drought Treatment and Evaluation on Their Drought Resistance

SHEN Siyan^1,2, XU Yanxia¹, MA Chunlei¹, CHEN Liang^1,*

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Abstract

In this study, two-year-old tea seedlings of four tea cultivars (Longjing 43, Zhuyeqi, Ningzhou 2 and Baiye 1) were used for natural drought test in pots. Their growth and adaptation under drought stress and after re-watering were determined. The effects of drought treatment on the physiological characteristics of different tea cultivars were evaluated, and their drought tolerances were comprehensively evaluated by subordinate function method. The results show that during drought treatment, soil volumetric water content of the four cultivars decreased gradually. Tea plants showed dehydration symptoms, with relative water content, superoxide dismutase activity, net photosynthetic rate and transpiration rate of leaves decreased, malondialdehyde, chlorophyll and carotenoid contents increased, the activities of peroxidase and catalase increased first and then decreased, water use efficiency increased first and then decreased. After re-watering, soil volumetric and relative water contents of four cultivars increased, whereas malondialdehyde content decreased. Peroxidase activities of tea cultivars decreased, except Longjing 43. The superoxide dismutase activities showed an opposite trend. Catalase activities of four cultivars decreased, but net photosynthetic rate was not significantly changed. Transpiration rate and water use efficiency increased. Except for Zhuyeqi, the amount of chlorophyll and carotenoids reduced. The drought resistance of four cultivars was comprehensively evaluated by subordinate function value, and the results show that Longjing 43>Ningzhou 2>Zhuyeqi>Baiye 1. This study provided a reference and theoretical basis for the screening of drought-tolerant tea cultivars and drought-resistant breeding.

Key words

drought resistance / drought stress / natural drought treatment / physiological index / subordinate function method

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SHEN Siyan, XU Yanxia, MA Chunlei, CHEN Liang. Effects of Physiological Characteristics of Different Tea Cultivars under Drought Treatment and Evaluation on Their Drought Resistance[J]. Journal of Tea Science. 2019, 39(2): 171-180 https://doi.org/10.13305/j.cnki.jts.2019.02.006

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