Journal of Food, Agriculture and Environment

Responses of hypocotyl elongation to light and sowing depth in peanut seedlings

Author(s):

Feifei Qin ^{1, 3}, Hui-lian Xu ²*, Dianqiu Lü ⁴*, Tetsuo Takano ¹*

Recieved Date: 2012-01-01, Accepted Date: 2012-04-20

Abstract:

Plant growth and health as well as the final shell yield is improved by the so-called AnM techniques including exposing the extra elongated hypocotyls to lift up the cotyledon node and induce xerophytophysiological regulations such as osmotic adjustment. Elongation of hypocotyls must be ensured by the dark conditions for germinating seeds in soil, which needs the seeds being sown enough and properly deep. Therefore, in the present experiment, we examined the effects of light and seeding depth on elongation and morphology as well as anthocyanin accumulation of hypocotyls of peanut seedlings. A germinating hypocotyl of peanut stopped its elongation when the cotyledons met light even under the soil if the soil was cracked. Light strongly induced anthocyanin accumulation as observed in purple-red hypocotyls of peanut seedlings. The light effects of elongation inhibition, changes in tissue and cell morphology and anthocyanin accumulation in hypocotyls were stronger in cultivar ‘Nakateyutaka’ than in ‘Chibahabtchi’. Although the photosynthetic functions were induced by light, the short hypocotyl and early development of the cotyledon node branches were not appreciated agronomically because, as described in our previous experiments, the early development of cotyledon node branches may make many problems for the later growth of the peanut crop. An extra elongated hypocotyl is also needed for the treatment of hypocotyl exposure to induce xerophytophysiological regulations. In the present experiment, it was found that seeds should be sown deep enough, for example, up to 4 cm and 6 cm for cultivars ‘Chibahabtchi’ and ‘Nakateyutaka’, respectively.

Keywords:

AnM technique, anthocyanin, histological and anatomical observation, hypocotyl elongation, light, peanut (Arachis hypogaea), sowing depth

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Agriculture
Pages: 607-612

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