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Comparative biochemical and morphological changes in imbibed cotton seed hypocotyls and radicles in situ and in vitro – Protein breakdown and elongation growth

Published online by Cambridge University Press:  19 September 2008

Eugene L. Vigil  and
Tung K. Fang
Eugene L. Vigil*
Affiliation:
Climate Stress Laboratory, USDA/ARS, Bld 046A, BARC-West, Beltsville, MD 20705, USA
Tung K. Fang
Affiliation:
Climate Stress Laboratory, USDA/ARS, Bld 046A, BARC-West, Beltsville, MD 20705, USA
*
*Correspondence
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Abstract

Axes, hypocotyls and radicles excised from dry cotton seeds (Gossypium hirsutum L. cv. M-8, a double haploid) were imbibed for 24 h and compared with axial segments (excised sections of embryos below the cotyledons) of imbibed, intact seeds. Radicles of excised axes had a 7.4-fold increase in length compared with only 5.2- and 5.7-fold increases, respectively, in radicles of intact seeds and in those isolated when dry. Change in hypocotyl length was not as extensive. EM data for hypocotyl and radicle cortical cells from dry and imbibed seeds revealed a major reduction in matrix protein in protein storage vacuoles along with significant organelle development at 24 h from the start of imbibition. This occurred in parallel with a reduction in salt-extracted proteins and an increase in 2% SDS-extractable proteins. SDS-PAGE of protein from low (0.2 M NaCI) and high (1.0 M NaCI) salt extracts showed a reduction in amount of the major storage proteins (53 and 48 kDa), these bands being almost totally absent in gels of protein extracts from imbibed radicles and significantly reduced in hypocotyls, within 24 h from the start of imbibition. These results indicate that initial elongation of hypocotyls and radicles in intact seeds or of excised axes, after 24 h imbibition, involves breakdown of storage proteins in these axial parts to supply nutrients for growth, with very limited contribution from the cotyledons.

Keywords

CottonGossypium hirsutum L.hypocotylin vitro germinationradicleprotein storage vacuolesSDS-PAGE
Type
Research Papers
Information
Seed Science Research , Volume 5 , Issue 1 , March 1995 , pp. 41 - 51
Copyright
Copyright © Cambridge University Press 1995

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