The Interaction Between ABA and Sugar Signalling Regulates Stomatal Production in Systemic Leaves by Controlling Sucrose Transport

Plant Cell & Environment, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

ABSTRACT A key feature of stress responses [closely relative to the phytohormone abscisic acid (ABA)] and associated acclimation in plants is dynamic adjustments related optimisation carbohydrate content between sink source organs. The production stomata, which consist a pore two adjacent guard cells, are central plant adaptation changing environment conditions. In this context, ABA core modulator environmentally determined stomatal development. It well established that reduces aperture but addition, hormone also enhances production. For example, when grown at very high CO 2 levels, Arabidopsis lines with defects biosynthesis have reduced By contrast, under standard conditions, these biosynthetic mutants show increased However, molecular mechanism(s) underpinning regulation remain largely unknown. review, we summarise current knowledge concerning sucrose transport signalling relating Further, provide fresh insights into possible function photosynthetic product induced‐ABA as balancer accumulation organs, control thereby adjust plants, by controlling systems.

Language: Английский

Linking leaf dark respiration to leaf traits and reflectance spectroscopy across diverse forest types

New Phytologist, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

Summary Leaf dark respiration ( R ), an important yet rarely quantified component of carbon cycling in forest ecosystems, is often simulated from leaf traits such as the maximum carboxylation capacity V cmax mass per area (LMA), nitrogen (N) and phosphorus (P) concentrations, terrestrial biosphere models. However, validity these relationships across types remains to be thoroughly assessed. Here, we analyzed variability its associations with other three temperate, subtropical tropical forests China, evaluating effectiveness spectroscopy a superior monitoring alternative. We found that magnesium calcium concentrations were more significant explaining cross‐site than commonly used like LMA, N P but univariate trait– always weak r 2 ≤ 0.15) forest‐specific. Although multivariate improved model performance, outperformed relationships, accurately predicted = 0.65) pinpointed factors contributing variability. Our findings reveal few novel greater scalability regarding , challenging use empirical process models emphasize potential promising alternative for estimating which could ultimately improve modeling plant respiration.

Language: Английский