Measurement of growth potential of the embryo in New York lettuce seed under various combinations of temperature, red light and hormones

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概要

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• The growth potentials in half and intact seeds of New York lettuce were estimated quantitatively by determining the mannitol concentrations which allow 50% germination. Half seeds (embryonic axes alone) incubated in the dark exhibited growth potentials equivalent to 0.55 _M mannitol at 20゜, 0.50 _M at 25゜, 0.30 _M at 30゜, and 0.24 _M at 35℃. Red light acted to promote the potentials of half seeds at 25゜ and 30℃ but not so appreciably at 20゜ and 35℃. The results presented here suggest that the growth potential of the embryonic axes is controlled by some thermo-labile process in addition to P_<fr>-dependent reaction (see Discussion). The restraining force of seed coats, estimated as the difference in growth potentials between half and intact seeds, was equivalent to about 0.4 _M mannitol and was affected neither by red light nor by temperatures tested (20゜-35℃). At 35℃, the growth potential of half seeds (0.24 to 0.26 _M) was far less than that of the restraining force of seed coats (0.4 _M), and this resulted in thermodormancy. GA as well as red irradiation increased the growth potential of embryonic axes at 25゜-30℃ but not at 35℃. Cotyledon expansion was not much increased by GA. KIN, on the other hand, increased the growth potential of both embryonic axes and cotyledons at 25゜-35℃, thus breaking the thermodormancy at 35℃. ABA lowered the growth potentials of both embryonic axes and cotyledons.

• 日本植物生理学会の論文

著者

• Takeda Go

  Laboratory Of Applied Biology Faculty Of Living Science Kyoto Prefectural University

• Matsubara Satoshi

  Laboratory of Applied Biology, Faculty of Living Science, Kyoto Prefectural University

• Matsubara Satoshi

  Laboratory Of Applied Biology Faculty Of Living Science Kyoto Prefectural University

関連論文

• Expression Pattern and Gene Structure of Phenylalanine Ammonia-Lyase in Pharbitis nil
• Accumulation of free amino acids in the tips of non-thermodormant embryonic axes accounts for the increase in the growth potential of New York lettuce seeds
• Effects of temperature, red light and homones on accumulation of free amino acids in osmotically growth-inhibited embryonic axes of New York lettuce seeds
• Activation of phosphate metabolism in cotyledons of Pharbitis nil in the early stage of germination as studied by multicompartmental analysis
• Changes revealed by a tracer technique in the amino acid metabolism of thermodormant and non-dormant New York lettuce seeds
• Measurement of growth potential of the embryo in New York lettuce seed under various combinations of temperature, red light and hormones
• Phytochrome-mediated accumulation of free amino acids in embryonic axes of New York lettuce seeds
• Rapid disappearance of small fat bodies during the early stage of imbibition of lettuce seeds
• Analysis of temperature effect on the germination of New York lettuce seeds

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