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Light acclimation at the end of the growing season in two broadleaved oak species

Content Provider	Springer Nature Link
Author	Ca, F. J. Sánchez Gómez, D. Gascó, A. Rodríguez Calcerrada, J. Gil, L. Warren, C. R. Aranda, I.
Copyright Year	2011
Abstract	The ability of plants to increase their net CO$_{2}$ assimilation rate in response to increased irradiance is due to morphological and physiological changes, which might be related to their shade tolerance and leaf ontogeny, but few studies have considered morphology and physiology. Two sympatric oak species (the shade-tolerant Q. petraea and the comparatively shade-intolerant Q. pyrenaica) were grown in hydroponic solution in low-light (LL) and high-light (HL) conditions. 5 months after leaf expansion under these conditions, half of the LL plants were transferred to high light (TLH). Transfer of Q. pyrenaica, from low- to high light led to photoinhibition and after 21 days in higher light there was little acclimation of the maximum rate of carboxylation (V$_{Cmax}$) or the maximum rate of electron transport (J$_{max}$). Q. pyrenaica TLH plants showed lower stomatal conductance at all times compared to plants growing in LL. Stomatal closure was the main limitation to photosynthesis after transfer in Q. pyrenaica. The increase in evaporative demand upon TLH did not affect hydraulic conductivity of Q. pyrenaica. In contrast, the more shade-tolerant Q. petraea showed a greater degree of acclimation of gas exchange in TLH than Q. pyrenaica and two weeks after transfer gas-exchange rates were as high as in LL plants. In Q. petraea, the most important changes occurred at the level of leaf biochemistry with significant increase in V$_{Cmax}$ that decreased the J$_{max}$/V$_{Cmax}$ ratio below values recorded in HL plants. However, this potential increase in photosynthesis was at least partially hamstrung by a decrease in internal conductance, which highlights the importance of internal conductance in acclimation to higher light in mature leaves. Neither oak species reached the photosynthetic rates of HL plants; however a trend towards leaf acclimation was observed in Q. petraea while the transfer was harmful to the leaves of Q. pyrenaica developed in the shade.
Starting Page	581
Ending Page	592
Page Count	12
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	49
Issue Number	4
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-05
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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