Premium
Changes in Free Proline Concentration in Sorghum and Soybean Plants Under Field Conditions 1
Author(s) -
Waldren R. P.,
Teare I. D.,
Ehler S. W.
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/cropsci1974.0011183x001400030034x
Subject(s) - proline , wilting , sorghum , biology , transpiration , irrigation , agronomy , moisture stress , drought stress , glycine , permanent wilting point , horticulture , botany , moisture , field capacity , chemistry , photosynthesis , amino acid , biochemistry , organic chemistry
Free proline in the leaves of sorghum [ Sorghum bicolor (L.) Moench cv. ‘Pioneer 846’] and soybean [ Glycine max (L.) cv. ‘Calland’] was measured in the field under drought stress and adequate soil moisture. Leaf water potential and stomatal diffusive resistance were the measures of drought stress in the plants. Free leaf proline in nonstressed plants changed during the day but seasonal changes were insignificant. Free proline increased with light intensity and varied widely in middle leaves that were shaded or received sunlight. Free proline did not accumulate significantly until plants were severely stressed and visibly wilting (about −20 bars leaf water potential in soybean). Variation was high in both stressed and nonstressed plants. However, factors that affected transpiration demand also affected free proline accumulation. For irrigation scheduling free proline was not a good indicator of drought stress in the field because it increased after the critical time to irrigate for maximum yield.