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Photosynthetic and Respiratory CO 2 Exchange of Sugar Beet Leaves as Influenced by Manganese Deficiency 1
Author(s) -
Terry Norman,
Ulrich Albert
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400040003x
Subject(s) - photosynthesis , manganese , biology , respiration , dry matter , sugar , sugar beet , botany , horticulture , chemistry , food science , organic chemistry
Photosynthetic and respiratory CO 2 exchange rates were determined for attached leaves of manganese‐deficient or ‐sufficient sugar beets ( Beta vulgaris L. cv. ‘F58‐554H1’) cultured hydroponkally in a growth chamber. On withholding Mn from the culture solution, the Mn concentration of the leaf blades decreased from 8 to 10 to about 0.3 meq Mn 2+ kg ‐1 dry matter and rates of photosynthetic CO 2 uptake per unit leaf area decreased to about onethird of the control rates. There was no apparent effect of Mn deficiency on stomatal opening since leaf diffusion resistance (r 1 ’) was unchanged, but mesophyll resistance to CO 2 transfer (r m ) increased from 2.5 to 10 sec cm ‐1 in low Mn leaves. Manganese deficiency decreased rates of photorespiratory evolution of CO 2 into CO 2 ‐free air but had no effect on respiration in the dark.