Plant Physiol. Illumina
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Plant Physiology 62:6-9 (1978)
© 1978 American Society of Plant Biologists

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Articles

Effects of Gibberellic Acid and Gold Light on Germination, Enzyme Activities, and Amino Acid Pool Size in a Dwarf Strain of Watermelon 1

Kathleen B. Evensen2 and J. Brent Loy

Department of Plant Science, University of New Hampshire, Durham, New Hampshire 03824

Gibberellic acid (GA3) promotes and continuous gold light inhibits germination of seeds of a dwarf strain (WB-2) of watermelon [Citrullus lanatus (Thunb.) Matsu. and Nakai]. Osmotic inhibition of germination with mannitol in light-grown seeds of WB-2 was only slightly reversed by GA3 at the concentrations used, whereas, GA3 substantially relieved osmotic inhibition in dark-grown seeds.

The effects of GA3 and gold light on development of catalase and invertase activities and on levels of free amino acids in germinating seeds of WB-2 were examined. Light depressed development of catalase and invertase activity. Levels of free amino acids increased more slowly in embryonic axes of light- than dark-incubated seeds, but in cotyledons higher levels of amino acids were maintained in light-grown seeds. GA3 accelerated the development of catalase activity in whole embryos and invertase activity in embryonic axes, but did not significantly affect invertase activity in cotyledons during germination. GA3 had little effect on amino acid pools in cotyledons and embryonic axes.

2 Present address: Department of Fruit Crops, University of Florida, Gainesville, Florida 32601.

1 Published with approval of the Director of the New Hampshire Agriculture Experiment Station as Scientific Contribution No. 859.






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Copyright © 1978 by the American Society of Plant Biologists