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Growth and physiological responses of isohydric and anisohydric poplars to drought.

Attia Z, Domec JC, Oren R, Way DA, Moshelion M - J. Exp. Bot. (2015)

Bottom Line: Low gs of the isohydric BS under drought reduced CO2 assimilation rates and biomass potential under moderate water stress.Overall, the results indicate three strategies for how closely related biomass species deal with water stress: survival-isohydric (BS), sensitive-anisohydric (BSxSI), and resilience-anisohydric (SI).Implications for woody biomass growth, water-use efficiency, and survival under variable environmental conditions are discussed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel.

No MeSH data available.


Related in: MedlinePlus

Relationship between (A) SWCg and Ψleaf, (B) Ψleaf and E, and (C) Kleaf and gs in three poplar genotypes grown in a semi-controlled greenhouse. Data binned by SWCg, every circle is a 5 point average: large circles, 70–100% SWCg, medium circles, 50–69% SWCg, small circles, 30–49% SWCg. BS (n = 42), SI (n = 210), BSxSI (n = 311). Lines connect the mean ± SE of the SWCg bins (30–49%, 50–69%, 70–100%). Different letters above the SE bars indicate significant differences between means using Tukey’s HSD test, P < 0.05.
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Figure 2: Relationship between (A) SWCg and Ψleaf, (B) Ψleaf and E, and (C) Kleaf and gs in three poplar genotypes grown in a semi-controlled greenhouse. Data binned by SWCg, every circle is a 5 point average: large circles, 70–100% SWCg, medium circles, 50–69% SWCg, small circles, 30–49% SWCg. BS (n = 42), SI (n = 210), BSxSI (n = 311). Lines connect the mean ± SE of the SWCg bins (30–49%, 50–69%, 70–100%). Different letters above the SE bars indicate significant differences between means using Tukey’s HSD test, P < 0.05.

Mentions: Under well-watered conditions (70–100% SWCg), Ψleaf of the SI was significantly less negative than the BS and BSxSI, but Ψleaf differences between the three genotypes disappeared at 30–49% SWCg (Fig. 1A). Thus, only the BS presented isohydric behaviour, maintaining constant Ψleaf with declining SWCg (Fig. 2A), and the stem water potential (Ψstem) showed the same tendency (Supplementary Fig. 1A). As a consequence, the water potential difference between the stem and the leaf (∆Ψleaf) did not vary between the three genotypes: ∆Ψleaf remained constant as SWCg decreased, generating a constant driving force (of around 0.3MPa) for water flow from the stem to the leaf (Supplementary Fig. 1B). This behaviour was made ​​possible by the fact that the BS sharply reduced E and gs in response to the declining SWCg, while BSxSI and SI kept higher E and gs as water depletion progressed, and were thus insensitive to the declining Ψleaf (Figs 1D,E and 2A,B).


Growth and physiological responses of isohydric and anisohydric poplars to drought.

Attia Z, Domec JC, Oren R, Way DA, Moshelion M - J. Exp. Bot. (2015)

Relationship between (A) SWCg and Ψleaf, (B) Ψleaf and E, and (C) Kleaf and gs in three poplar genotypes grown in a semi-controlled greenhouse. Data binned by SWCg, every circle is a 5 point average: large circles, 70–100% SWCg, medium circles, 50–69% SWCg, small circles, 30–49% SWCg. BS (n = 42), SI (n = 210), BSxSI (n = 311). Lines connect the mean ± SE of the SWCg bins (30–49%, 50–69%, 70–100%). Different letters above the SE bars indicate significant differences between means using Tukey’s HSD test, P < 0.05.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4493787&req=5

Figure 2: Relationship between (A) SWCg and Ψleaf, (B) Ψleaf and E, and (C) Kleaf and gs in three poplar genotypes grown in a semi-controlled greenhouse. Data binned by SWCg, every circle is a 5 point average: large circles, 70–100% SWCg, medium circles, 50–69% SWCg, small circles, 30–49% SWCg. BS (n = 42), SI (n = 210), BSxSI (n = 311). Lines connect the mean ± SE of the SWCg bins (30–49%, 50–69%, 70–100%). Different letters above the SE bars indicate significant differences between means using Tukey’s HSD test, P < 0.05.
Mentions: Under well-watered conditions (70–100% SWCg), Ψleaf of the SI was significantly less negative than the BS and BSxSI, but Ψleaf differences between the three genotypes disappeared at 30–49% SWCg (Fig. 1A). Thus, only the BS presented isohydric behaviour, maintaining constant Ψleaf with declining SWCg (Fig. 2A), and the stem water potential (Ψstem) showed the same tendency (Supplementary Fig. 1A). As a consequence, the water potential difference between the stem and the leaf (∆Ψleaf) did not vary between the three genotypes: ∆Ψleaf remained constant as SWCg decreased, generating a constant driving force (of around 0.3MPa) for water flow from the stem to the leaf (Supplementary Fig. 1B). This behaviour was made ​​possible by the fact that the BS sharply reduced E and gs in response to the declining SWCg, while BSxSI and SI kept higher E and gs as water depletion progressed, and were thus insensitive to the declining Ψleaf (Figs 1D,E and 2A,B).

Bottom Line: Low gs of the isohydric BS under drought reduced CO2 assimilation rates and biomass potential under moderate water stress.Overall, the results indicate three strategies for how closely related biomass species deal with water stress: survival-isohydric (BS), sensitive-anisohydric (BSxSI), and resilience-anisohydric (SI).Implications for woody biomass growth, water-use efficiency, and survival under variable environmental conditions are discussed.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel.

No MeSH data available.


Related in: MedlinePlus