Premium
No contribution of the pentose phosphate pathway in dormancy‐breaking of cocklebur seeds
Author(s) -
SATOH SHIGERU,
ESASHI YOHJI
Publication year - 1980
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1980.tb03249.x
Subject(s) - pentose phosphate pathway , dormancy , xanthium , imbibition , biology , botany , germination , seed dormancy , phosphate , enzyme , biochemistry , glycolysis
The role of the oxidative pentose phosphate (PP) pathway in the dormancy‐breaking of cocklebur ( Xanthium pennsylvanicum Wallr.) seeds was investigated. D‐[1‐ 14 C]‐glucose or D‐[6‐ 14 C]‐glucose was fed to dormant and non‐dormant lower seeds or to their axial or cotyledonary segments which were imbibed for different durations, and C 6 /C 1 ratios of respired 14 CO 2 as an index of the PP pathway activity were calculated. Contrary to expectation, there was no significant difference in the C 6 /C 1 ratios between the dormant and non‐dormant seeds or segments during a water imbition period of 24 h, although the PP pathway actually operated already in an early stage of water imbibition. Also concerning the activities of G6PDH and 6PGDH, the key enzymes of this pathway, no difference between the dormant and non‐dormant seeds was found. It was thus concluded that, unlike other seeds, there is no contribution of the PP pathway to the regulation of dormancy of the cocklebur seed.