文献类型：期刊文献

英文题名：Ecotypic Variation in Photosynthesis, Stomatal Conductance, and Water Use Efficiency of Illicium lanceolatum in Response to Light Intensity Under Drought and Recovery

作者：Cao, Yonghui[1,2] Zhou, Benzhi[1,2]

第一作者：曹永慧;Cao, Yonghui

通信作者：Cao, YH[1];Cao, YH[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Peoples R China;[2]Natl Forestry & Grassland Adm, Qianjiangyuan Forest Ecosyst Res Stn, Hangzhou 311400, Peoples R China

年份：2026

卷号：15

期号：3

外文期刊名：PLANTS-BASEL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001687772800001)】；

基金：This work was supported by General program of the Natural Science Foundation of China (no. 32171774), and the Special Fund for Basic Scientific Research from Central-level Non-profit Scientific Research Institutes of China (grant no. CAFYBB2017MA004).

语种：英文

外文关键词：ecotype selection; Illicium lanceolatum; medicinal plant; photosynthetic parameters; stomatal conductance; leaf-water use efficiency; water stress; recovering; light intensity

摘要：Increasingly frequent extreme droughts threaten forest vegetation and highlight the need to identify drought-tolerant germplasm. To support conservation and cultivation of Illicium lanceolatum, we investigated ecotypic differences in photosynthetic responses to short-term drought and rewatering under varying light intensity. One-year-old seedlings from four I. lanceolatum ecotypes originating from the Zhejiang (Lin'an, LA; Kaihua, KH), Jiangxi (Wu'ning, WN), and Fujian (Nan'ping, NP) provinces in China were subjected to drought stress by withholding irrigation and subsequent rewatering. Photosynthesis-light response curves were measured before drought; 2, 4, and 7 days after the last watering; and following rewatering. Short-term drought significantly affected photosynthetic traits in an ecotype-dependent manner. Maximum net photosynthetic rate, light saturation point, light compensation point, and apparent quantum yield increased during drought, indicating enhanced utilization of both high and low light. After rewatering, stomatal conductance increased significantly in the WN and KH ecotypes but declined in the NP ecotype when compared with those under the initial water supply. Instantaneous water use efficiency (A/E) recovered rapidly in all ecotypes and exceeded pre-drought levels. Under light intensity above 1500 mu molm-2s-1, stomatal conductance exhibited a significant nonlinear relationship with water use efficiency. Overall, these physiological responses indicate that I. lanceolatum is moderately drought-tolerant and exhibits mild sensitivity to soil water variation. The WN and KH ecotypes showed superior improvement in water use efficiency under drought and high light, suggesting their potential for breeding drought-resistant cultivars and for afforestation in drought-prone environments.