scholarly journals Gas exchange and water relations of 3 sizes of containerized Picea mariana seedlings subjected to atmospheric and edaphic water stress under controlled conditions

1995 ◽  
Vol 52 (1) ◽  
pp. 1-9 ◽  
Author(s):  
JD Stewart ◽  
PY Bernier
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Water Relations ◽  
Picea Mariana ◽  
Controlled Conditions

Gas exchange and water relations responses to drought of fast- and slow-growing black spruce families

1997 ◽  
Vol 75 (10) ◽  
pp. 1700-1706 ◽  
Author(s):  
Weixing Tan ◽  
Terence J. Blake
Keyword(s):  
Growth Rate ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Soil Water ◽  
Water Relations ◽  
Picea Mariana ◽  
Black Spruce ◽  
Turgor Pressure ◽  
Fast Growing ◽  
Slow Growing

To determine how different mechanisms of drought tolerance contribute to growth rate under drought, this study compared four full-sib black spruce (Picea mariana (Mill.) B.S.P.) families which differed in growth rate when soil water became limiting, stomatal conductance, photosynthesis, and water relations responses to drought. Repeated drought cycles were imposed by withholding soil water in a nursery and physiological responses were measured near the end of the first and third cycle. The most vigorous family under drought had greater osmotic adjustment and maintained higher rates of net photosynthesis during the first cycle of drought and resumed higher rates of photosynthesis sooner upon stress relief, compared with two slow-growing families. Pressure–volume analysis of drought-stressed shoot tissues indicated that the fast-growing family exhibited a larger degree of elastic enhancement (i.e., decrease in bulk modulus of elasticity), which would explain its higher turgor pressure, compared with the two less vigorous families. However, family differences in gas exchange and water relations largely diminished when seedlings were exposed to repeated cycles of drought. Therefore, fast-growing black spruce families under drought may gain selective growth advantage by a better ability to tolerate, rather than postpone, momentary dehydration. Short-term screening trials could be used to detect drought tolerant genotypes in black spruce. Key words: drought, family variation, photosynthesis, Picea mariana, stomatal conductance, water relations.

Water relations, growth, and leaf gas exchange as affected by water stress in Jatropha curcas

2013 ◽  
Vol 89 ◽  
pp. 21-29 ◽  
Author(s):  
A. Fini ◽  
C. Bellasio ◽  
S. Pollastri ◽  
M. Tattini ◽  
F. Ferrini
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Water Relations ◽  
Jatropha Curcas ◽  
Leaf Gas Exchange

Diurnal and seasonal variations in gas exchange and water relations of lowland and upland black spruce ecotypes

1995 ◽  
Vol 73 (5) ◽  
pp. 716-722 ◽  
Author(s):  
Abdenbi Zine El Abidine ◽  
James D. Stewart ◽  
André P. Plamondon ◽  
Pierre Y. Bernier
Keyword(s):  
Gas Exchange ◽  
Environmental Factors ◽  
Water Relations ◽  
Picea Mariana ◽  
Black Spruce ◽  
Net Photosynthesis ◽  
Atmospheric Conditions ◽  
Mature Trees ◽  
Ecotypic Differentiation ◽  
Seasonal Responses

Gas exchange and water relations were measured on seedlings from two pairs of upland and lowland black spruce (Picea mariana (Mill.) BSP) populations. The seedlings were planted under natural atmospheric conditions in exterior sand beds. Measurements were carried out on eight separate days during the summer of 1992. Diurnal and seasonal responses of gas exchange and water relations parameters to natural changes in environmental factors were analyzed for possible ecotypic differences. Differences were found among the four populations and within one of the two upland–lowland pairs. However, no differences could be linked significantly to an upland–lowland ecotypic differentiation. The physiological responses are discussed with respect to diurnal and seasonal changes in environmental factors and to similarities with results from an earlier experiment involving mature trees from the same four populations. Key words: Picea mariana, water stress, net photosynthesis, stomatal conductance.

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