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Breeding Behavior of 6x‐Amphiploid ✕ Avena sativa F 1 Hybrids 1
Author(s) -
Forsberg R. A.,
Shands H. L.
Publication year - 1969
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/cropsci1969.0011183x000900010022x
Subject(s) - biology , panicle , selfing , backcrossing , avena , hybrid , botany , raceme , oryza sativa , horticulture , inflorescence , gene , genetics , population , demography , sociology
Wide variation existed among 6x‐amphiploid ✕ A. sativa L. F 1 plants for panicle length and shape, number and size of spikelets, and degree of awn development. Seed set from artificial first‐backcross pollinations with A. sativa was 1.26% (44 kernels from 3,485 florets). Since all florets were completely self‐sterile on F 1 plants spatially isolated from other oats or on bagged panicles of nonisolated plants, it is concluded that kernels harvested from most nonisolated F 1 'S arose from natural crossing rather than from selfing. In a 1966 test, nonisolated Ft plants were surrounded by a mixture of A. sativa plants which flowered over an extended period. One or more kernels were obtained from 73% of these plants. In contrast, hand pollinations over a 12‐year period resulted in seed set in only 18% of F 1 plants involved. Evidence is cited for the occasional loss, in early F 1 zygotic divisions, of part or all of specific A. sativa chromosomes whose genes inhibit wild‐type grain characters, or condition resistance to crown rust.