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Comparison of Water-Related Physiological Characteristics and Photosynthesis Between Alnus Maritima and A. Incana Ssp. Tenuifolia in America

Author: LiXiuZuo
Tutor: LiuXiPing
School: Northwest University of Science and Technology
Course: Botany
Keywords: Alnus water-related physiological parameters photosynthetic characters ecological distribution
CLC: S792.14
Type: Master's thesis
Year: 2010
Downloads: 36
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Abstract


This study compared stomatal conductance (Gs), leaf water potential (ψleaf), basic osmotic adjustment and photosynthetic responses of Alnus maritima and A. incana ssp. tenuifolia growing in America under artificial soil humidities, to explore physiological reasons of gigantic difference in ecological distribution of the both tree species. The results indicated that, (1) A. maritima kept a lower Gs and the correlation coefficients between A. maritima and meteorological factors ie. air temperature, vapor pressure deficit, relative humidity was lower than A. tenuifolia under well watered irrigation. During the dry-down period, A. maritima showed a weaker ability to keep stomatal open influenced by the decrease ofψleaf. In rewatered experiment, recovery speed of Gs of A. maritima was slower than that of A. tenuifolia.(2) Under well watered condition, A. maritima kept a higherψleaf and a higher threshold ofψleaf leading to stomata close compared to A. tenuifolia. Under drought stress, the decline inψleaf but was larger than A. tenuifolia.(3) There was no significant difference in the osmotic regulation of the two species. However, both species showed: (a) a decrease in solute potential at full turgor (ψssat) and, (b) a decline of maximum variation rate of turgor pressure against solute potential, (c) an increase in solute potential at turgor loss point(ψstlp), (d)ψssat-ψstlp dropped after surfing drought stressed. Noticeablyψstlp of A. maritima was higher, butψssat-ψstlp was lower than A. tenuifolia.(4) Light response curve of A. maritima showed a higher maximum net photosynthetic rate (Amax), apparent quantum yield (AQY), dark respiration rate (Rd) and light compensation point (LCP), but a lower light saturation point (LSP), compared with A. tenuifolia. Net photosynthetic rate (Pn), maximum fluorescence yield in light-adapted state (Fm’), non-cycle photosynthetic electron transport rate (ETR) and photochemical chlorophyll fluorescence quenching coefficient (qP) of A. maritima were higher than those of A. tenuifolia. Drought treatment led to a significant decrease in effective PS II quantum yield (Fv’/Fm’), in ETR and non-photochemical quenching coefficient (qN) in both species, particularly in A. maritima.These results indicated that the rarity and patchy distribution of A. maritima may partly attribute to (1) the lower sensitivity of leaf stomatal, (2) higher leaf water potential, (3) lower osmotic adjustment ability under drought stress, (4) higher sensitivity to drought stress and (5) smaller range of effective photosynthetic solar radiation.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved trees > Alder
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