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Germination of Vicia Species and Interspecific Lines as Affected by Temperature Cycles 1
Author(s) -
Elkins D. M.,
Hoveland C. S.,
Donnelly E. D.
Publication year - 1966
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1966.0011183x000600010014x
Subject(s) - germination , interspecific competition , biology , hybrid , interspecific hybridization , interspecific hybrids , botany , horticulture , agronomy
Temperature cycles of 4.5–21, 21–4.5, 21–32, and 32–21 C were used in germinating scarified and unscarlfied seed of vetch species and advanced generation interspecific hybrids. The initial temperature of a cycle had marked effects on both the rate and final germination percentage of certain entries. Variation in response to temperature cycles was found between Vicia species and within V. sativa and V. angustifolia . Scarified seed of parents of the interspecific hybrids differed greatly; the V. sativa parent (Ala. 1894) germinated faster at high temperatures, whereas the V. angustifolia parent (P.I. 121275) germinated faster at low temperatures. The behavior of interspecific hybrid progeny indicated a recombination of genes that conditioned the physiological requirements for germination. Unscarified seed of V. grandiflora and an interspecific hybrid germinated more rapidly at low temperatures. Unscarified seed of another hard‐seeded species, V. angustifolia , responded in a reverse manner, germinating more rapidly at high temperatures. Germination response to temperature was found to be controlled by hard seedcoat in addition to a physiological response of the embryo.