Stomatal and growth responses to hydraulic and chemical changes induced by progressive soil drying.
Stomatal and growth responses to hydraulic and chemical changes induced by progressive soil drying.
复制标题
土壤逐渐干燥引起的水力和化学变化的气孔和生长反应
DOI：
10.1093/jxb/erx381
复制
发表时间：
2017-12-16
影响因子：
6.9
通讯作者：
Davies WJ
中科院分区：
文献类型：
--
作者：
Li X;Wilkinson S;Shen J;Forde BG;Davies WJ
本研究同步研究了土壤渐进干燥对玉米生长和生理的影响。这表明，水分和化学变化可以调节植物的发育和功能在干旱开始。更好地了解作物对干旱胁迫的生理反应对于确保气候变化下作物的持续生产力非常重要。本文以15日龄玉米（Zea mays L.）6 d非致死期的土壤干旱[土壤水势（SWP）从-0.20 MPa降至-0.81 MPa]。根系生长最初在干燥期间受到刺激（当SWP从-0.31MPa降至-0.38MPa时，而浇水充足的花盆中为-0.29MPa），随后在第5-6天受到抑制（SWP从-0.63MPa降至-0.81MPa）。在第2 ~ 3天，随着根水势的下降，脱落酸（阿坝）在根中开始积累。叶片伸长从第4天（SWP小于-0.51MPa）开始受到抑制，这是在叶片阿坝含量开始增加之后，但与叶片水势的下降一致。气孔导度的限制早在年轻的叶（第四）（第3天）比老叶（第三）。叶片和根的乙烯含量在干燥过程中下降，但在各自的阿坝含量增加。这项工作确定了土壤干燥开始时水力和化学变化的关键时间，这对于启动早期气孔和生长对干旱的反应很重要。
This study synchronously investigated maize growth and physiological responses to progressive soil drying. It indicates that hydraulic and chemical changes may regulate plant development and functioning during onset of drought. A better understanding of physiological responses of crops to drought stress is important for ensuring sustained crop productivity under climate change. Here, we studied the effect on 15-day-old maize (Zea mays L.) plants of a 6 d non-lethal period of soil drying [soil water potential (SWP) decreased from –0.20 MPa to –0.81 MPa]. Root growth was initially stimulated during drying (when SWP decreased from –0.31 MPa to –0.38 MPa, compared with –0.29 MPa in well-watered pots), followed by inhibition during Days 5–6 (SWP from –0.63 MPa to –0.81 MPa). Abscisic acid (ABA) in the root began to accumulate as the root water potential declined during Days 2–3. Leaf elongation was inhibited from Day 4 (SWP less than –0.51 MPa), just after leaf ABA content began to increase, but coinciding with a decline in leaf water potential. The stomatal conductance was restricted earlier in the younger leaf (fourth) (on Day 3) than in the older leaf (third). The ethylene content of leaves and roots decreased during drying, but after the respective increase in ABA contents. This work identified critical timing of hydraulic and chemical changes at the onset of soil drying, which can be important in initiating early stomatal and growth responses to drought.
登录
查看更多内容
影响因子：
56.9
作者：
BOYER, JS
通讯作者：
BOYER, JS
影响因子：
7.4
作者：
Buckley, Thomas N.;John, Grace P.;Sack, Lawren
通讯作者：
Sack, Lawren
影响因子：
7.4
作者：
CREELMAN, RA;MASON, HS;MULLET, JE
通讯作者：
MULLET, JE
影响因子：
5.8
作者：
Boonjung, H;Fukai, S
通讯作者：
Fukai, S
影响因子：
5.2
作者：
Kusaka, M;Lalusin, AG;Fujimura, T
通讯作者：
Fujimura, T