Influence of water availability on the physiology and leaf anatomical structure of a medicinal orchid, Bletilla striata
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摘要: 通过水分控制实验,研究不同土壤水分条件对白及 (Bletilla striata (Thunb. ex A. Murray)Rchb. f.)光合作用、叶片解剖结构、生物量和多糖含量的影响。结果表明,低水分处理不仅使白及的最大光合速率、气孔导度、光反应中心Ⅱ活性及叶绿素含量等参数降低;也使叶肉层变薄、上表皮增厚、生物量和多糖含量下降。气孔导度降低是白及在低水分条件下光合能力下降的主要原因。低水分条件可引起白及光合碳同化能力下降,导致生物量和多糖积累减少,进而影响白及的产量和品质。Abstract: In the present study, a pot experiment was conducted to investigate the effects of relative soil water content on photosynthetic rate, leaf anatomy, biomass, and polysaccharide content in Bletilla striata (Thunb. ex A. Murray) Rchb. f.. Our results showed that drought stress decreased the photosynthetic rate, stomatal conductance, PSⅡ activity, and chlorophyll content, thinned the mesophyll, thickened the adaxial epidermis, and decreased the biomass and polysaccharide content of B. striata. The reduction in stomatal conductance was largely responsible for the decline in photosynthetic capacity in B. striata under drought stress. This, in turn, led to the reduction of biomass and polysaccharide content, and eventually affected the quality and yield of B. striata.
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Keywords:
- Bletilla striata /
- Water availability /
- Photosynthesis /
- Leaf anatomy /
- Polysaccharides
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[1] 国家药典委员会. 中华人民共和国药典[M]. 北京:中国医药科技出版社, 2015. [2] 任风鸣, 刘艳, 李滢, 杨天建, 韩凤, 宋经元. 白及属药用植物的资源分布及繁育[J]. 中草药, 2016, 47(24):4478-4487. Ren FM, Liu Y, Li Y, Yang TJ, Han F, Song JY. Resource distribution and breeding of medicinal plants in genus Bletilla Reichb. f.[J]. Chinese Traditional and Herbal Drugs, 2016, 47(24):4478-4487.
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