Impairment in reproductive development is a major factor limiting yield of black gram under zinc deficiency
2009
Pandey, N.,University of Lucknow (India). Botany Dept. | Pathak, G.C.,University of Lucknow (India). Botany Dept. | Sharma, C.P.,University of Lucknow (India). Botany Dept.
Black gram cv. IPU 94 plants grown in sand culture with deficient zinc (0.1 microM Zn) nutrition and those deprived of normal (1 microM) Zn supply at the initiation of flowering showed decrease in dry matter production and especially seed yield. These plants showed a decrease in the size of anthers and stigmatic heads, pollen producing capacity of the anthers and stigmatic exudations. Zn deficiency caused structural alterations in exine and retarded germination of pollen grains and tube growth. The pollen extracts and stigmatic exudates of the Zn-deficient plants showed an increase in activities of acid phosphatase isoforms and inhibition of esterase isoforms. Zn deficiency led to a decrease in the number of pods, seeds per pod and seed mass, altered seed coat topography and reduced seeds germinability. Low seed yield under Zn deficiency is attributed to the role of Zn in pollen functions, and also in pollen-pistil interactions.
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