水分胁迫对三峡库区消落带桑树幼苗生理特性的影响

doi:10.11707/j.1001-7488.20121219

Scientia Silvae Sinicae ›› 2012, Vol. 48 ›› Issue (12): 122-127.doi: 10.11707/j.1001-7488.20121219

Effects of Water Stress on Physiological Characteristics of Mulberry(Morus alba) seedlings in the Hydro-Fluctuation Belt of the Three Gorges Reservoir Area

Huang Xiaohui^1,2, Liu Yun¹, Li Jiaxing¹, Xiong Xingzheng¹, Yin Xiaohua¹, Chen Yang¹, Qin Jian³, Huang Xianzhi³, Du Yingwu⁴

1. Department of Forestry, College of Resources and Environment, Southwest University Chongqing 400716;2. Chongqing Key laboratory of the Three Gorges Area Forest Ecology Protection and Restoration Chongqing Academy of Forestry Chongqing 400036;3. Institute of Sericulture and Systems Biology, Southwest University Chongqing 400716;4. Chongqing Silkworm Industry Management Station Chongqing 400020

Received:2011-10-12 Revised:2011-12-22 Online:2012-12-25 Published:2012-12-25

Abstract

Abstract:

Guisang 12, a variety of mulberry (Morus alba), was used to study the effects of different levels of water hardening on physiological characteristics of the mulberry seedlings in the hydro-fluctuation belt of the Three Gorges Reservoir Area. The seedlings were subjected to different water regimes for 30 days. The results showed that: the chlorophyll content of mulberry seedlings was increased by 10.4% under the drought hardening (DH) condition than that of CK, while decreased by 3.2% under the waterlogging hardening (WH) condition than that of CK. With the soil moisture content reducing, the stomatal conductance (G_s) and transpiration rate (Tr) of mulberry seedlings both declined remarkably; The photosynthetic rate (P_n) of mulberry seedlings under the drought hardening and waterlogging hardening conditions was all higher than that of CK, and the intercellular CO₂ concentration (C_i) under the two conditions was lower than that of CK; The instantaneous water use efficiency of mulberry seedlings under the drought hardening and waterlogging hardening conditions was remarkably increased by 57% and 27% than that of CK, respectively, and the abscisic acid (ABA) content in the two conditions were remarkably increased by 79% and 29% than that of CK, respectively.

Key words: mulberry, seedlings hardening, the hydro-fluctuation belt of the Three Gorges Reservoir Area, physiological characteristics

CLC Number:

S718.43

Huang Xiaohui;Liu Yun;Li Jiaxing;Xiong Xingzheng;Yin Xiaohua;Chen Yang;Qin Jian;Huang Xianzhi;Du Yingwu. Effects of Water Stress on Physiological Characteristics of Mulberry(Morus alba) seedlings in the Hydro-Fluctuation Belt of the Three Gorges Reservoir Area[J]. Scientia Silvae Sinicae, 2012, 48(12): 122-127.

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Effects of Water Stress on Physiological Characteristics of Mulberry(Morus alba) seedlings in the Hydro-Fluctuation Belt of the Three Gorges Reservoir Area

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