浙江农业学报 ›› 2024, Vol. 36 ›› Issue (2): 308-324.DOI: 10.3969/j.issn.1004-1524.20230117

• 园艺科学 • 上一篇    下一篇

四种红豆属植物耐旱性综合评价

田晓明(), 向光锋, 牟村, 吕浩, 马涛, 朱路, 彭静, 张敏, 何艳   

  1. 湖南省植物园,湖南 长沙 410116
  • 收稿日期:2023-02-09 出版日期:2024-02-25 发布日期:2024-03-05
  • 作者简介:田晓明(1986—),女,湖南湘潭人,博士,高级工程师,研究方向为珍贵树种选育、珍稀濒危植物保护与利用。E-mail:tianxiaoming1986@126.com
  • 基金资助:
    2022年湖南省重点野生动植物保护项目(2022(湘财预)0002号)

Drought tolerance evaluation of four species of Ormosia

TIAN Xiaoming(), XIANG Guangfeng, MOU Cun, LYU Hao, MA Tao, ZHU Lu, PENG Jing, ZHANG Min, HE Yan   

  1. Hunan Botanical Garden, Changsha 410116, China
  • Received:2023-02-09 Online:2024-02-25 Published:2024-03-05

摘要:

为探究软荚红豆(Ormosia semicastrata)、花榈木(Ormosia henryi)、木荚红豆(Ormosia xylocarpa)和鄂西红豆(Ormosia hosiei)等4种红豆属植物在干旱胁迫与复水处理条件下的生理响应机制和种间耐旱性差异,采用盆栽控水试验法进行干旱胁迫试验。试验分别设置了对照组(CK)、轻度干旱组(LD)、中度干旱组(MD)和重度干旱组(SD)4个处理组,干旱胁迫28 d后进行复水处理,分别于第0、7、14、21、28、42天(复水后第14天)测定植物形态、生理和光合特性等指标的变化,利用主成分分析法和隶属函数分析法对4种植物的耐旱性进行综合评价。结果表明,SD处理组4种红豆属植物均出现明显的旱害症状,木荚红豆旱害症状出现最早也最严重,鄂西红豆则表现最轻。4种植物生理指标随干旱胁迫程度增加和胁迫时间延长,叶片相对含水量(RWC)呈降低趋势,电导率(REC)和丙二醛(MDA)含量则逐渐升高,超氧化物歧化酶(SOD)活性、可溶性蛋白(SP)和叶绿素含量(CHL)呈先升后降趋势,叶片净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)逐渐降低,胞间CO2浓度(Ci)呈先降后升趋势。复水处理14 d后,除木荚红豆SD处理组植株死亡无法恢复外,4种红豆属植物各处理组出现的旱害症状均得到缓解;同时,RWC、SOD活性、SP和CHL含量、PnGsTr呈上升趋势,而REC、MDA含量呈下降趋势,各树种SD处理组指标变化最为显著。通过主成分分析法筛选出REC、PnGsTr为4种红豆属植物耐旱性评价关键指标;通过隶属函数分析法综合评价4种红豆属植物的耐旱能力,从强到弱排序依次为:鄂西红豆、花榈木、木荚红豆、软荚红豆。研究结果可为红豆属植物的保护、耐旱性育种和栽培应用提供理论依据。

关键词: 红豆属, 干旱胁迫, 生理响应, 复水, 综合评价

Abstract:

In order to explore the physiological response mechanisms and differences in drought tolerance among four species of Ormosia, including Ormosia semiastrata, Ormosia henryi, Ormosia xylocarpa, and Ormosia hosiei, under drought stress and rehydration conditions, a pot culture method was conducted using four species of Ormosia as test materials. The experiment set up four treatment groups, namely, control group (CK), mild drought group (LD), moderate drought group (MD), and severe drought group (SD). After 28 days of drought stress, all test materials were subjected to rehydration treatment. Changes in plant morphological, physiological, and photosynthetic characteristics were measured on 0, 7, 14, 21, 28, and 42 days (14 days after rehydration) of the experiment, and the drought tolerance of the four species of Ormosia was comprehensively evaluated using principal component analysis and membership function analysis. The results showed that the SD treatment group of four species of Ormosia all showed significant drought damage symptoms, while the O. xylocarpa showed the earliest and the most severe drought damage symptoms, while the O. hosiei showed the least drought damage symptoms. As the degree of drought stress increased and the duration of stress prolonged, the relative water content (RWC) of leaves decreased, while electrical conductivity (REC) and malondialdehyde (MDA) content gradually increased. The activity of superoxide dismutase (SOD), soluble protein (SP) and chlorophyll (CHL) content first increased and then decreased. The Net photosynthetic rate of leaf (Pn), stomatal conductance (Gs), and transpiration rate (Tr) gradually decreased, while intercellular CO2 concentration (Ci) first decreased and then increased. After 14 days of rehydration treatment, except for the death of the plants in the SD treatment group of O. xylocarpa, the symptoms of drought damage in each treatment group of four species of Ormosia were alleviated, while RWC, SOD activity, SP content, CHL content, Pn, Gs and Tr showed an upward trend, REC and MDA content showed a downward trend, with the most significant changes in indicators in the SD group. REC, Pn, Gs and Tr were selected as the key index for drought tolerance evaluation of four species of Ormosia by principal component analysis, and the drought tolerance of four species of Ormosia was comprehensively evaluated by membership function analysis. The order from strong to weak was: O. hosiei, O. henryi, O. xylocarpa, O. semiastrata. The research results could provide theoretical basis for the protection, drought resistance breeding and cultivation application of Ormosia.

Key words: Ormosia, drought stress, physiological response, rehydration, comprehensive evaluation

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