The photosynthetic parameters of cucumber as affected by irradiances with different red:far-red ratios.

Autor:	Shibuya, T.
Další autoři:	Endo, R. Yuba, T. Kitaya, Y.
Jazyk:	angličtina
Předmět:	botanika okurka setá Cucumis sativus články journal articles intrinsic water-use efficiency Rubisco stomatal conductance stomatal density
Druh dokumentu:	Non-fiction
ISSN:	0006-3134
Abstrakt:	Abstract: We compared photosynthetic performance between cucumber (Cucumis sativus L.) leaves acclimated to saturating irradiances with high red: far red (R:FR = 10) and normal R:FR (= 1.4) ratios. The net photosynthetic rate (PN) and stomatal conductance (gs) of the leaves acclimated to high R:FR were greater than those of the leaves acclimated to normal R:FR; the greater gs partly explains the greater PN. The greater gs of the high-R:FR-leaves probably resulted from a higher stomatal density and/or a greater size. PN of the high R:FR leaves was still greater than that of the normal R:FR leaves at the same intercellular CO2 concentration (ci). This indicates that non-stomatal factors also increased the photosynthetic capacity of the high R:FR leaves. The maximum Rubisco carboxylase activity estimated from a PN-ci curve analysis was also greater in the high R:FR leaves, however, the intrinsic water-use efficiency (WUEi = PN/gs) of the high R:FR leaves was lower than that of the normal R:FR leaves.
Databáze:	Katalog Knihovny AV ČR
Externí odkaz:	Full text from SpringerLink