Plos One, ( ISI ), Year (2015-4)

Title : ( Peach Water Relations, Gas Exchange, Growth and Shoot Mortality under Water Deficit in Semi-Arid Weather Conditions )

Authors: Mitra Rahmati , Gholam Hossein Davarynejad , Genard M , Mohammad Bannayan Aval , Majid Azizi , Vercambre G ,

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In this study the sensitivity of peach tree (Prunus persica L.) to three water stress levels from mid-pit hardening until harvest was assessed. Seasonal patterns of shoot and fruit growth, gas exchange (leaf photosynthesis, stomatal conductance and transpiration) as well as carbon (C) storage/mobilization were evaluated in relation to plant water status. A simple C balance model was also developed to investigate sink-source relationship in relation to plant water status at the tree level. The C source was estimated through the leaf area dynamics and leaf photosynthesis rate along the season. The C sink was estimated for maintenance respiration and growth of shoots and fruits. Water stress significantly reduced gas exchange, and fruit, and shoot growth, but increased fruit dry matter concentration. Growth was more affected by water deficit than photosynthesis, and shoot growth was more sensitive to water deficit than fruit growth. Reduction of shoot growth was associated with a decrease of shoot elongation, emergence, and high shoot mortality. Water scarcity affected tree C assimilation due to two interacting factors: (i) reduction in leaf photosynthesis (-23% and -50% under moderate (MS) and severe (SS) water stress compared to low (LS) stress during growth season) and (ii) reduction in total leaf area (-57% and -79% under MS and SS compared to LS at harvest). Our field data analysis suggested a Ψstem threshold of -1.5 MPa below which daily net C gain became negative, i.e. C assimilation became lower than C needed for respiration and growth. Negative C balance under MS and SS associated with decline of trunk carbohydrate reserves - may have led to drought-induced vegetative mortality.

Keywords

leaf assimilation and midday leaf water potential (C) Relations between leaf assimilation and stomatal conductance and (D) Relations between leaf ... [39] who showed that the shoot system architecture of young peach trees was ... Water stress had a large impact on shoot
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@article{paperid:1047587,
author = {Rahmati, Mitra and Davarynejad, Gholam Hossein and Genard M and Bannayan Aval, Mohammad and Azizi, Majid and Vercambre G},
title = {Peach Water Relations, Gas Exchange, Growth and Shoot Mortality under Water Deficit in Semi-Arid Weather Conditions},
journal = {Plos One},
year = {2015},
month = {April},
issn = {1932-6203},
keywords = {leaf assimilation and midday leaf water potential (C) Relations between leaf assimilation and stomatal conductance and (D) Relations between leaf ... [39] who showed that the shoot system architecture of young peach trees was ... Water stress had a large impact on shoot mortality},
}

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%0 Journal Article
%T Peach Water Relations, Gas Exchange, Growth and Shoot Mortality under Water Deficit in Semi-Arid Weather Conditions
%A Rahmati, Mitra
%A Davarynejad, Gholam Hossein
%A Genard M
%A Bannayan Aval, Mohammad
%A Azizi, Majid
%A Vercambre G
%J Plos One
%@ 1932-6203
%D 2015

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