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Diurnal Changes in Photosynthesis in Wheat Under Different Source‐Sink Relationships
Author(s) -
Ghildival M. C.
Publication year - 1991
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.1991.tb00906.x
Subject(s) - photosynthesis , sink (geography) , morning , biology , agronomy , shoot , botany , evening , physics , cartography , astronomy , geography
Abstract The effect of alteration in source‐sink ratio by defoliation and ear removal on diurnal changes in photosynthesis was examined in wheat var. Kalyansona. The photosynthesis rate was maximum during initial few hours in the forenoon and decreased towards evening. The increase in sink demand for a particular leaf by excising other sources leaves, sustained higher rate of photosynthesis during the day. On the other hand de‐eared plants where sink demand was decreased by removal of main shoot ears and all the tillers, photosynthesis rate showed a more rapid decline towards evening, although, the photosynthesis rates were more or less similar to control plants in the morning. These results indicate the influence of sink demand on sustenance of photosynthesis during the day.