The stomata occupy a central position in the pathways for both loss of water from plants and exchange CO2. It is commonly assumed that they therefore provide main short-term control transpiration photosynthesis, though detailed criteria on which their movements are based not well understood likely to depend particular ecological situation. This paper first reviews methods available quantifying exerted by over photosynthesis absence feedbacks between gasexchange stomatal function. discussion...

In all studies of the effects water deficits on plant functioning there is a need for an accurate and comprehensive definition treatments their status. The various measures status used in soil science are reviewed appropriateness different purposes such as mechanistic plants, breeding drought-tolerant or management irrigation systems reviewed. An important conclusion that frequent emphasis potential rather than cell turgor can be shown to misleading, measurements leaf. disadvantages current...

Thermal imaging using infrared (IR) is now an established technology for the study of stomatal responses and phenotyping plants differences in behaviour. This paper outlines potential applications IR sensing drought phenotyping, with particular emphasis on a description problems extrapolation technique from single leaves controlled environments to plant canopies field plots, examples taken studies grapevine (Vitis vinifera L.) rice (Oryza sativa L.). Particular include sensitivity leaf...

This paper reviews and discusses strategies for the use of thermal imaging studies stomatal conductance in field compares techniques image collection analysis. Measurements were taken under a range environmental conditions on sunlit shaded canopies to illustrate variability temperatures derived stress indices. A simple procedure is presented correcting calibration drift within images from low-cost imager used (SnapShot 225, Infrared Solutions, Inc.). The wet dry reference surfaces as...

ABSTRACT This paper describes a new approach to the calibration of thermal infrared measurements leaf temperature for estimation stomatal conductance and illustrates its application imaging plant leaves. The is based on simple reformulation energy balance equation that makes use reference surfaces known water vapour. an alternative accurate measurement all components potentially wide in studies behaviour. resolution technique when applied images evaluated some results using laboratory study...

Abstract. The potential role of stomatal closure in the control xylem embolism is investigated by means a simple model hydraulic flow plants. Maintenance maximally efficient conducting system requires stomata to close an appropriate fashion as evaporative demand increases order prevent shoot water potentials falling below threshold value at which cavitations occur. showed that optimal behaviour required depends on soil availability. Further analysis demonstrated there could be certain...

Plants raised from shoot-tip cultures of apple (Malus x domestica Borkh ) were grown in divided pots so that approximately half the root system could be exposed to soil drying whilst remainder was well watered. Water withheld this way for 24 d. During time, daily increment leaf area declined 65% control plants, which had all their roots watered Both expansion and, more particularly, initiation inhibited. loss per plant also fell 70%% rate exhibited by plants. No significant differences...

The achievements made in genomic technology recent decades are yet to be matched by fast and accurate crop phenotyping methods. Such methods required for improvement efforts meet expected demand food fibre the future. This review evaluates role of proximal remote sensing buggies field-based with a particular focus on application currently available sensor large-scale field phenotyping. To illustrate potential development high throughput techniques, case study is presented sample data sets...

Thermal imaging is a potential tool for estimating plant temperature, which can be used as an indicator of stomatal closure and water deficit stress. In this study, new method processing analysing thermal images was developed. By using remote sensing software, the information from visible combined, were classified to identify leaf area sunlit shaded parts canopy, temperature statistics specific canopy components calculated. The applied data greenhouse water‐stress experiment Vicia faba L....

Abstract. Plant scientists concerned both with crop improvement and understanding the control mechanisms of complex processes such as photosynthesis need to identify those that are most important in restricting overall rate quantify relative importance different components. The techniques have been used for quantifying component limiting net assimilation reviewed related a fundamental definition based on sensitivity analysis. It is concluded many methods currently use, including standard...

Journal Article Effects of Abscisic Acid and Water Stress on Development Morphology Wheat Get access S. A. QUARRIE, QUARRIE Plant Breeding InstituteTrumpington, Cambridge, CB2 2LQ Search for other works by this author on: Oxford Academic PubMed Google Scholar H. G. JONES Experimental Botany, Volume 28, Issue 1, February 1977, Pages 192–203, https://doi.org/10.1093/jxb/28.1.192 Published: 01 1977 history Received: 14 June 1976

Temperatures of leaves or canopies can be used as indicators stomatal closure in response to soil water deficit. In 2 years field experiments with grapevines (Vitis vinifera L., cvs Castelão and Aragonês), it was found that thermal imaging distinguish between irrigated non-irrigated canopies, even deficit irrigation treatments. Average canopy temperature inversely correlated conductance measured a porometer. Variation the distribution temperatures within not reliable indicator stress. A...