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Intraspecific variation in thermal acclimation of photosynthesis across a range of temperatures in a perennial crop

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ABSTRACT

Plants acclimate to the thermal regime they experience. We analysed intra-specific variations in the thermal acclimation of photosynthesis in a perennial herbaceous crop by comparing cultivars from contrasting origins grown at a range of temperatures. It was concluded that both temperate and Mediterranean cultivars display strong patterns of thermal acclimation in the 5-40°C range. No evidence of superior performance was found for Mediterranean genotypes at high temperatures.

No MeSH data available.


Impact of growth temperature on the final leaf size, SLA and leaf nitrogen concentration of two alfalfa cultivars of temperate (open circles, Harpe cv) and Mediterranean (filled circles, Barmed cv) origins. Leaves were all sampled on the main stem between node ranks 8 and 9. The letters indicate homogeneous groups of means between the different growth temperatures (Fisher’s LSD test). No significant cultivar effect was found.
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plw035-F1: Impact of growth temperature on the final leaf size, SLA and leaf nitrogen concentration of two alfalfa cultivars of temperate (open circles, Harpe cv) and Mediterranean (filled circles, Barmed cv) origins. Leaves were all sampled on the main stem between node ranks 8 and 9. The letters indicate homogeneous groups of means between the different growth temperatures (Fisher’s LSD test). No significant cultivar effect was found.

Mentions: The impacts of growth temperature (Tgrowth) on final leaf size (Larea), SLA and leaf nitrogen content (Na) are presented in Figure 1. Growth temperature significantly affected the three leaf traits studied (ANOVA, F6,42 > 5.9, P < 10−3) in both seedling (Fig. 1) and cutting (not shown) plants. The final leaf size was highest at intermediate Tgrowth (20 and 25 °C) and was smaller at both ends of the temperature range tested (5 and 35 °C). SLA was also maximum at a moderate Tgrowth (20–30 °C). The reduction in SLA due to low Tgrowth (5 and 10 °C) appeared to be greater than that observed at high temperatures (35 °C) within the range tested. Concerning the nitrogen content, Na patterns mirrored the pattern observed for SLA. Na was lowest at a moderate Tgrowth (15–30 °C) and maximum at extreme Tgrowth values (5, 10 and 35 °C). ANOVA analyses did not demonstrate any significant differences regarding the origins of the plants in terms of Larea and SLA (ANOVA, F1,85 < 29.0, P > 0.2), but were significant for Na (ANOVA, F1,85 = 17.7, P < 0.05).Figure 1.


Intraspecific variation in thermal acclimation of photosynthesis across a range of temperatures in a perennial crop
Impact of growth temperature on the final leaf size, SLA and leaf nitrogen concentration of two alfalfa cultivars of temperate (open circles, Harpe cv) and Mediterranean (filled circles, Barmed cv) origins. Leaves were all sampled on the main stem between node ranks 8 and 9. The letters indicate homogeneous groups of means between the different growth temperatures (Fisher’s LSD test). No significant cultivar effect was found.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4940478&req=5

plw035-F1: Impact of growth temperature on the final leaf size, SLA and leaf nitrogen concentration of two alfalfa cultivars of temperate (open circles, Harpe cv) and Mediterranean (filled circles, Barmed cv) origins. Leaves were all sampled on the main stem between node ranks 8 and 9. The letters indicate homogeneous groups of means between the different growth temperatures (Fisher’s LSD test). No significant cultivar effect was found.
Mentions: The impacts of growth temperature (Tgrowth) on final leaf size (Larea), SLA and leaf nitrogen content (Na) are presented in Figure 1. Growth temperature significantly affected the three leaf traits studied (ANOVA, F6,42 > 5.9, P < 10−3) in both seedling (Fig. 1) and cutting (not shown) plants. The final leaf size was highest at intermediate Tgrowth (20 and 25 °C) and was smaller at both ends of the temperature range tested (5 and 35 °C). SLA was also maximum at a moderate Tgrowth (20–30 °C). The reduction in SLA due to low Tgrowth (5 and 10 °C) appeared to be greater than that observed at high temperatures (35 °C) within the range tested. Concerning the nitrogen content, Na patterns mirrored the pattern observed for SLA. Na was lowest at a moderate Tgrowth (15–30 °C) and maximum at extreme Tgrowth values (5, 10 and 35 °C). ANOVA analyses did not demonstrate any significant differences regarding the origins of the plants in terms of Larea and SLA (ANOVA, F1,85 < 29.0, P > 0.2), but were significant for Na (ANOVA, F1,85 = 17.7, P < 0.05).Figure 1.

View Article: PubMed Central - PubMed

ABSTRACT

Plants acclimate to the thermal regime they experience. We analysed intra-specific variations in the thermal acclimation of photosynthesis in a perennial herbaceous crop by comparing cultivars from contrasting origins grown at a range of temperatures. It was concluded that both temperate and Mediterranean cultivars display strong patterns of thermal acclimation in the 5-40&deg;C range. No evidence of superior performance was found for Mediterranean genotypes at high temperatures.

No MeSH data available.