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The Effect of Soil Water Regimes on Leaf Water Potential, Growth and Development of Soybeans
Author(s) -
ADJETWUM DANIEL C.,
SPLITTSTOESSER WALTER E.
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb04872.x
Subject(s) - nitrate reductase , nitrogen , photosynthesis , chlorophyll , agronomy , plant stem , dry weight , nitrate , soil water , biology , horticulture , water potential , chemistry , botany , ecology , organic chemistry
The growth and development of soybeans ( Glycine max L. cv. Amsoy) was studied at soil matric potentials of −0.1 to −1.0 bars. Chlorophyll, photosynthesis, and leaf nitrogen per plant was greatest at −4 bars leaf water potential. Leaf area, number of internodes, plant height and dry weight of vegetative parts declined as leaf water potential decreased from −2 to −19 bars. Nitrogen content and nitrate reductase activity per g fresh weight determined the percentage protein of individual seeds but nitrogen content and nitrate reductase activity per plant determined the amount of total seed protein. The protein synthesized in the seed changed little in amino acid composition with changes in leaf water potential. Leaf water potentials above or below −4 bars decreased yield, total protein and total lipid but plants produced the largest percentage of individual seed protein at −19 bars leaf water potential.