Growth Characteristics and Photosystem Ⅱ Functions of Sorghum bicolor×S.sudanense Seedlings under Drought Stress

doi:10.11733/j.issn.1007-0435.2012.05.014

›› 2012, Vol. 20 ›› Issue (5): 881-887.DOI: 10.11733/j.issn.1007-0435.2012.05.014

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Growth Characteristics and Photosystem Ⅱ Functions of Sorghum bicolor×S.sudanense Seedlings under Drought Stress

ZHANG Hui-hui, ZHANG Xiu-li, HU Yan-bo, XU Nan, LI Xin, TIAN Ye, ZHANG Ting, SUN Guang-yu

College of Life Science, Northeast Forest University, Harbin, Heilongjiang Province 150040, China

Received:2012-04-25 Revised:2012-06-11 Online:2012-10-15 Published:2012-11-01

高粱-苏丹草杂交种的生长特性和光合功能研究

张会慧, 张秀丽, 胡彦波, 许楠, 李鑫, 田野, 张婷, 孙广玉

东北林业大学生命科学学院, 黑龙江哈尔滨 150040

通讯作者: 孙广玉,E-mail:sungy@vip.sina.com
作者简介:张会慧(1986-),男,内蒙赤峰人,博士研究生,主要从事植物生理生态学研究,E-mail:xtwfwf@126.com
基金资助:
国家自然科学基金(31070307)(30771746);黑龙江省自然科学基金重点项目(ZD201105);国家科技支撑项目(2011BAD08B02-3);黑龙江重大项目(GA09B201-02);国家林业局重点项目(2010-29)(2011-32)资助

Abstract

Abstract: The responses of plant growth, chlorophyll fluorescence and light energy allocation in leaves of Sorghum bicolor×S.sudanense and Sorghum sudanense (Piper) Stapf seedlings to drought stress were investigated. Results showed that plant height, root length and total biomass of S.bicolor×S.sudanense were significantly higher than that of S.sudanense (Piper) Stapf. Relative water content (RWC) in above-ground S.bicolor×S.sudanense under drought stress was higher than that of S.sudanense (Piper) Stapf.. The activity and opening proportion of PSⅡreaction centers and electron transport rate (ETR) in leaves of both plants were reduced under drought stresS.Under severe drought stress, ETR in leaves of S.bicolor×S.sudanense maintained higher than that of S.sudanense (Piper) Stapf to alleviate photoinhibition. The proportion of light energy used to quantum yield of PSⅡ photochemistry (Ф_PSⅡ) and xanthophyll-mediated thermal dissipation (Ф_NPQ) decreased under drought. But, under severe drought stress, Ф_PSⅡ and Ф_NPQ in leaves of S.bicolor×S.sudanense seedlings were much higher than that of S.sudanense (Piper) Stapf. Quantum yield used to thermal dissipation in non-functional PSⅡ (Ф_NF) in leaves of S.bicolor×S.sudanense was lower than that of S.sudanense (Piper) Stapf. Thermal dissipation by xanthophyll cycle played an important role in photoprotection of S.sudanense (Piper) Stapf under severe drought condition to ensure physiological function of PSⅡ reaction centers and alleviate photoinhibition.

Key words: Sorghum bicolor×S.sudanense, Hybrid, Drought, PSⅡ, Energy distribution

摘要： 研究了高丹草(Sorghum bicolor×S.sudanense)和苏丹草(Sorghum sudanense (Piper) Stapf.)的生长特性、叶片叶绿素荧光特性及激发能的分配对干旱的响应。结果表明:高丹草的株高、根系长度和干物质积累等明显优于苏丹草,干旱下高丹草地上部相对含水率高于苏丹草。干旱降低了2种牧草叶片的PSⅡ反应中心活性和反应中心开放程度,电子传递速率降低,但高丹草叶片在重度干旱下的电子传递速率高于苏丹草,光抑制程度明显低于苏丹草。干旱下2种牧草叶片的PSⅡ反应中心吸收的光能用于光化学反应的量子产额(Ф_PSⅡ)和依赖于叶黄素循环的能量耗散的量子产额(Ф_NPQ)所占比例呈现降低趋势,但重度干旱下高丹草叶片的Ф_PSⅡ和Ф_NPQ明显高于苏丹草,而 PSⅡ反应中心的热耗散量子产额(Ф_NF)所占比例低于苏丹草,说明高丹草叶片在重度干旱下叶片以叶黄素循环为主的光保护机制在防御光破坏方面发挥着重要作用,从而保证了PSⅡ反应中心的正常生理功能,减轻了高丹草在重度干旱下的光抑制程度。

关键词: 高丹草, 杂交种, 干旱, PSⅡ, 能量分配

CLC Number:

Q945.79

ZHANG Hui-hui, ZHANG Xiu-li, HU Yan-bo, XU Nan, LI Xin, TIAN Ye, ZHANG Ting, SUN Guang-yu. Growth Characteristics and Photosystem Ⅱ Functions of Sorghum bicolor×S.sudanense Seedlings under Drought Stress[J]. , 2012, 20(5): 881-887.

张会慧, 张秀丽, 胡彦波, 许楠, 李鑫, 田野, 张婷, 孙广玉. 高粱-苏丹草杂交种的生长特性和光合功能研究[J]. , 2012, 20(5): 881-887.

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Growth Characteristics and Photosystem Ⅱ Functions of Sorghum bicolor×S.sudanense Seedlings under Drought Stress

高粱-苏丹草杂交种的生长特性和光合功能研究

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