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Cytogenetics and Breeding Behavior of a Hexaploid Agrotricum Immune from Wheat Streak Mosaic Virus 1
Author(s) -
Wong Raymond SzeChung,
Wells Darrell G.,
Gardner Wayne S.
Publication year - 1974
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/cropsci1974.0011183x001400030020x
Subject(s) - agropyron , biology , hybrid , meiosis , pollen , chromosome , cytogenetics , elymus , genetics , metaphase , plant breeding , botany , poaceae , gene
A breeding line of spring wheat, C.I. 15092, selected from Triticum aestivum L. em Thell./ Agropyron intermedium (Host) Beauv. bred true for immunity from wheat streak mosaic virus (WSMV). F 1 hybrids of C.I. 15092/ T. aestivum ‘Fletcher’ had 20 paired and 2 unpaired chromosomes of unequal size at metaphase I of meiosis in pollen mother cells. Apparently C.I. 15092 had one Agropyron chromosome pair carrying genes for immunity from WSMV substituted for a homoeologous wheat chromosome pair. Immunity from WSMV was completely dominant in hybrids. Inheritance data indicated that the Agropyron chromosome was transmitted through 27% male and 21% female gametes of the F 1 hybrid C.I. 15092/Fletcher. A small number of immune F 2 and F 3 plants were comparable to control plants in seed set, indicating that the whole Agropyron chromosome added to the wheat complement was not strikingly harmful in some plants, at least, not to self‐fertility.