The Role of Bundle Sheath Extensions and Life Form in Stomatal Responses to Leaf Water Status

草本植物 维管束 水力阻力 生物 捆绑 木本植物 湿度 植物 松属 表皮(动物学) 园艺 解剖 物理 材料科学 机械 复合材料 热力学
作者
Thomas Buckley,Lawren Sack,Matthew J. Gilbert
出处
期刊:Plant Physiology [Oxford University Press]
卷期号:156 (2): 962-973 被引量:84
标识
DOI:10.1104/pp.111.175638
摘要

Abstract Bundle sheath extensions (BSEs) are key features of leaf structure with currently little-understood functions. To test the hypothesis that BSEs reduce the hydraulic resistance from the bundle sheath to the epidermis (r be) and thereby accelerate hydropassive stomatal movements, we compared stomatal responses with reduced humidity and leaf excision among 20 species with heterobaric or homobaric leaves and herbaceous or woody life forms. We hypothesized that low r be due to the presence of BSEs would increase the rate of stomatal opening (V) during transient wrong-way responses, but more so during wrong-way responses to excision (V e) than humidity (V h), thus increasing the ratio of V e to V h. We predicted the same trends for herbaceous relative to woody species given greater hydraulic resistance in woody species. We found that V e, V h, and their ratio were 2.3 to 4.4 times greater in heterobaric than homobaric leaves and 2.0 to 3.1 times greater in herbaceous than woody species. To assess possible causes for these differences, we simulated these experiments in a dynamic compartment/resistance model, which predicted larger V e and V e/V h in leaves with smaller r be. These results support the hypothesis that BSEs reduce r be. Comparison of our data and simulations suggested that r be is approximately 4 to 16 times larger in homobaric than heterobaric leaves. Our study provides new evidence that variations in the distribution of hydraulic resistance within the leaf and plant are central to understanding dynamic stomatal responses to water status and their ecological correlates and that BSEs play several key roles in the functional ecology of heterobaric leaves.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
2秒前
Xiaoyang完成签到,获得积分10
2秒前
loski发布了新的文献求助10
2秒前
3秒前
虚心月饼发布了新的文献求助10
4秒前
5秒前
Lucas应助123采纳,获得10
7秒前
香蕉觅云应助KIORking采纳,获得10
8秒前
8秒前
Liufgui应助执着又蓝采纳,获得20
9秒前
9秒前
正直水池完成签到 ,获得积分10
9秒前
9秒前
阿克完成签到,获得积分10
9秒前
一方通行发布了新的文献求助10
10秒前
perovskite完成签到,获得积分10
10秒前
如梦如幻91完成签到,获得积分10
10秒前
10秒前
10秒前
妮露的修狗完成签到,获得积分10
11秒前
12秒前
13秒前
文献发布了新的文献求助30
15秒前
无花果应助我不吃胡萝卜采纳,获得10
16秒前
16秒前
17秒前
自信的电灯胆完成签到,获得积分20
17秒前
量子星尘发布了新的文献求助10
18秒前
19秒前
20秒前
清辉夜凝发布了新的文献求助10
20秒前
22秒前
少敏敏发布了新的文献求助10
23秒前
24秒前
嘻哈发布了新的文献求助10
26秒前
苏y发布了新的文献求助10
26秒前
凶狠的乐巧完成签到,获得积分10
27秒前
阿克发布了新的文献求助10
28秒前
29秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989378
求助须知:如何正确求助?哪些是违规求助? 3531442
关于积分的说明 11254002
捐赠科研通 3270126
什么是DOI,文献DOI怎么找? 1804887
邀请新用户注册赠送积分活动 882087
科研通“疑难数据库(出版商)”最低求助积分说明 809173