Journal
PHOTOSYNTHETICA
Volume 44, Issue 4, Pages 561-568Publisher
ACAD SCI CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-006-0072-z
Keywords
internal CO2 concentration; net photosynthetic rate; osmotic drought; stomatal conductance; transpiration; Zea
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Influence of drought (D) on changes of leaf water potential (psi) and parameters of gas exchange in D-resistant and D-sensitive genotypes of triticale and maize was compared. Soil D (from -0.01 to -2.45 MPa) was simulated by mannitol solutions. At -0.013 MPa significant differences in T, net photosynthetic rate (P-N), transpiration rate (E), stomatal conductance (g(s)), and internal CO2 concentration (C-i) of D-resistant and D-sensitive triticale and maize genotypes were not found. Together with the increase in concentration of the mannitol solution the impact of D on E and g(s) for D-sensitive genotypes (CHD-12, Ankora) became lower than for the D-resistant ones (CHD-247, Tina). Inversely, impact of D on psi was higher in D-sensitive than D-resistant genotypes. From 1 to 3 d of D, a higher decrease in P-N was observed in D-resistant genotypes than in the D-sensitive ones. Under prolonged D (5-14 d) and simultaneous more severe D the decrease in P-N was lower in D-resistant than in D-sensitive genotypes. Changes in psi, P-N, E, and g(s) caused by D in genotypes differing in the drought susceptibility were similar for triticale and maize. Compared to control plants, increase of C-i was different for triticale and maize genotypes. Hence one of the physiological reasons of different susceptibility to D between sensitive and resistant genotypes is more efficient protection of tissue water status in resistant genotypes reflected in higher decrease in g, and limiting E compared to the sensitive ones. Other reason, observed in D-resistant genotypes during the recovery from D-stress, was more efficient removal of detrimental effects of D.
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