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Nitrogen Nutrition and Photosynthesis in Sugar Beet ( Beta vulgaris L.) 1
Author(s) -
Nevins D. J.,
Loomis R. S.
Publication year - 1970
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/cropsci1970.0011183x001000010009x
Subject(s) - sugar beet , photosynthesis , nitrogen , biology , chlorophyll , sugar , nitrogen deficiency , nitrate , botany , nutrient , nitrogen assimilation , horticulture , agronomy , chemistry , food science , ecology , organic chemistry
Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves. Nitrogen deficiency reduced the chlorophyll concentration and photochemical capacity of the older leaves but not of young and recently mature leaves. The maximum rate of photosynthesis was reduced in leaves of all ages. This was correlated with a smaller leaf protein content and with an increase in CO 2 diffusion resistances. Although the rate of photosynthesis was reduced as much as 40% when plants were grown for 14 days without nitrogen, the effects were reversible, and activity could be restored to the normal rate within 4 days by adding nitrate nitrogen to the deficient nutrient solution.