浙江农业学报 ›› 2021, Vol. 33 ›› Issue (9): 1650-1659.DOI: 10.3969/j.issn.1004-1524.2021.09.09

• 园艺科学 • 上一篇    下一篇

干旱胁迫对黄薇光合特性和若干生理生化指标的影响

郑钢a,b,c(), 顾翠花a,b,c, 王杰a,b,c, 林琳a,b,c,*()   

  1. 浙江农林大学 a.风景园林与建筑学院
    b.浙江省园林植物种质创新与利用重点实验室
    c.南方园林植物种质创新与利用国家林业和草原局重点实验室,浙江 杭州 311300
  • 收稿日期:2020-11-13 出版日期:2021-09-25 发布日期:2021-10-09
  • 通讯作者: 林琳
  • 作者简介:* 林琳,E-mail: 928299135@qq.com
    郑钢(1964—),男,浙江诸暨人,学士,实验师,主要从事园林植物遗传育种与种质创新研究。E-mail: 305788868@qq.com
  • 基金资助:
    浙江省自然科学基金(LY21C160001);浙江省大学生科技活动计划暨新苗人才计划(2021R412051)

Effects of drought stress on photosynthetic characteristics and several physiological and biochemical indexes of Heimia myrtifolia Cham.et Schlechtend.

ZHENG Ganga,b,c(), GU Cuihuaa,b,c, WANG Jiea,b,c, LIN Lina,b,c,*()   

  1. a. School of Landscape and Architecture
    b. Zhejiang Provincial Key Laboratory of Germplasm Innovation and Utilization for Garden Plants
    c. Key Laboratory of National Forestry and Grassland Administration on Germplasm Innovation and Utilization for Southern Garden Plants, Zhejiang A & F University, Hangzhou 311300, China
  • Received:2020-11-13 Online:2021-09-25 Published:2021-10-09
  • Contact: LIN Lin

摘要:

为探究黄薇(Heimia myrtifolia)对干旱胁迫的适应能力,以黄薇一年生扦插苗为试验材料,设置5个水分处理(CK、T1、T2、T3、T4,土壤相对含水量分别保持在65%~75%、45%~60%、30%~45%、15%~30%、5%~15%),采用盆栽试验连续处理20 d,研究黄薇部分生理生化指标、光合作用和气孔变化对干旱胁迫的响应。结果表明:随着干旱程度的加深,黄薇叶片的净光合速率、蒸腾速率、气孔导度显著(P<0.05)下降,胞间二氧化碳浓度先降后升,类胡萝卜素、叶绿素和叶绿素a、b含量呈上升趋势,叶片下表皮气孔随着土壤水分散失而关闭,气孔形态结构也发生适应性的变化;丙二醛含量持续增高,过氧化氢酶活性和过氧化物酶活性先上升后下降,超氧化物歧化酶在T1~T2处理下保持较高活性,在T3处理下降至CK水平;脯氨酸含量先下降后上升,可溶性糖含量显著(P<0.05)增加。综上,黄薇对轻中度干旱具有良好的适应性,但不能承受长时间的重度干旱。研究结果可为后续黄薇的引种驯化和培育应用提供理论依据。

关键词: 黄薇, 干旱胁迫, 抗氧化酶, 渗透调节物质, 光合参数, 气孔

Abstract:

To explore the resistance of Heimia myrtifolia Cham.et Schlechtend. to drought stress, the one-year cutting seedlings of Heimia myrtifolia were used as the experimental materials with five treatments (namely, CK, T1, T2, T3, T4, and the soil water content was controled at 65%-75%, 45%-60%, 30%-45%, 15%-30%, 5%-15%, accordingly) for 20 d, to study responses of several physiological and biochemical indexes, and photosynthesis and stomatal characteristics of Heimia myrtifolia under drought stress. The results showed that the net photosynthetic rate, transpiration rate and stomatal conductance decreased significantly (P<0.05) with the elevated drought stress, while the intercellular carbon dioxide concentration decreased firstly then increased. The contents of carotenoids, chlorophyll and chlorophyll a, b all showed an upward trend with the elevated drought stress, while the inferior epidermal porosity of leaves closed with the loss of soil water, and the stomatal morphology and structure also changed adaptively. Malondialdehyde content kept on increasing, while the catalase activity and peroxidase activity first increased and then decreased with the elevated drought stress. The superoxide dismutase activity remained relatively active under T1 and T2 treatments, yet went down to CK level under T3 treatment. Proline content decreased first and then increased, while soluble sugar content increased significantly (P<0.05) with the elevated drought stress. To sum up, Heimia myrtifolia could resistant to mild and moderate drought, but it could not withstand prolonged, severe drought. The results could provide theoretical basis for the introduction, domestication and cultivation of Heimia myrtifolia in the future.

Key words: Heimia myrtifolia, drought stress, antioxidant enzymes, osmotic regulation substances, photosynthetic parameters, stomata

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