A Comparative-Study of Seed Viability in Inga Species - Desiccation Tolerance in Relation to the Physical Characteristics and Chemical-Composition of the Embryo

Pritchard, HW, Haye, AJ, Wright, WJ and Steadman, KJ (1995) A Comparative-Study of Seed Viability in Inga Species - Desiccation Tolerance in Relation to the Physical Characteristics and Chemical-Composition of the Embryo. Seed Science and Technology, 23 1: 85-100.

Author Pritchard, HW
Haye, AJ
Wright, WJ
Steadman, KJ
Title A Comparative-Study of Seed Viability in Inga Species - Desiccation Tolerance in Relation to the Physical Characteristics and Chemical-Composition of the Embryo
Journal name Seed Science and Technology   Check publisher's open access policy
ISSN 0251-0952
Publication date 1995-01-01
Year available 1995
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 23
Issue 1
Start page 85
End page 100
Total pages 16
Place of publication ZURICH
Publisher ISTA
Language eng
Abstract Seed (embryo) viability was investigated in seven species of the tropical legume genus Inga to determine the relationship between desiccation tolerance and the physical and/or chemical characteristics of the embryo. For all species, final germination (radicle emergence) percentage of isolated embryos was maximal at a temperature between 16 degrees C and 31 to 36 degrees C. Lower levels of germination were seen at 11 degrees C in a majority of species. Below this temperature the few seeds that germinated did not produce epicotyls. Embryo size and dry weight varied ten- to eight-fold between I. marginata and I. densiflora, from 1.1 x 0.8 x 0.5 cm and 0.2 g to 3.2 x 1.3 x 1.0 cm and 1.5 g respectively. Linear relations were observed between the dry weight of the embryonic axis and the cotyledons; in relation to the dry weight of the cotyledons, the axis dry weight was 0.8% on the average. Desiccation under up to three regimes (15 degrees C, 26 degrees C and 36 degrees C) reduced germination when the embryonic axis and cotyledon moisture content fell below 55 to 50% and 45 and 40% respectively; little or no germination occurred after dehydration to 20 to 30% embryo moisture content. Desiccation sensitivity was relatively independent of drying rate as influenced by the physical characteristics of the embryo or the drying conditions used. Total lipid and soluble carbohydrate content were estimated at 0.6 to 3.8% and 1.6 to 4.5% of embryo dry weight respectively. The results indicate that the frequently encountered desiccation intolerance in Inga embryos may be associated with critically-low levels of specific soluble carbohydrates in their tissues.
Keyword Agronomy
Plant Sciences
Horticulture
Agriculture
Plant Sciences
AGRONOMY
HORTICULTURE
PLANT SCIENCES
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: ResearcherID Downloads - Archived
 
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