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Growth and Metabolic Changes of Cowpea Plants as Affected by Water Deficiency and Indole‐3‐Yl‐Acetic Acid
Author(s) -
Khalil Sohair,
Mandurah Hanan M.
Publication year - 1989
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1989.tb00751.x
Subject(s) - shoot , vigna , water content , nitrogen , sowing , horticulture , chemistry , dry weight , plant stem , indole 3 acetic acid , agronomy , biology , auxin , biochemistry , geotechnical engineering , organic chemistry , gene , engineering
Cowpea plants ( Vigna sinensis Savi.) were grown in pots for two successive years. These plants were daily maintained water holding capacities (15, 25, 45, 65 %). The foliage of plants grown at every level of soil moisture was sprayed till dripping with IAA solutions (0, 10, 50, 100 mg/l) three times after 3, 6 and 9 weeks from sowing. Samples were taken at the two physiological stages before flowering and during flowering for growth measurements and determinations of nitrogen fractions. Water shortage led to retardation of stem length, number of internodes, number of leaves and dry weight shoots. IAA increasing the same parameters only when applied at concentrations of 10 and 50mg/1 at moisture level 65 %, 45 % and 25 % of W.H.C. Water stress decreased total‐N and protein‐N contents of cowpea shoots. On the other hand total soluble‐ N content was increased under the same conditions. IAA increased total‐N and protein‐N content of cowpea shoots. Meanwhile, the same growth regulator decreased total soluble‐N when applied at 45% 25 % and 15 % W.H.C. levels.