Cross compatibility relationships among species of Avena

Abstract

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Selection for seed set in crosses of Avena sativa L. × A. Abyssinica Hochst.

“…More than 120 backcrosses were attempted on the pentaploid plants with pollen from Bacata and Kyto . No seed was obtained, however, which is at variance with the successful backcrossing onto pentaploids reported by NtsHIYAMA (1962), ZILLINSKY (1954), and SADANAGA & SIMONS (1960) .…”

“…Half of the hybrid seedlings and propagules (obtained from splitting crowns) from other F 1 plants were treated with colchicine using the techniques given by ZILLINSKY (1954) . Seeds borne on colchicine-treated tillers were germinated on moist blotters, and root tips were cut from the seedlings, after which the seedlings were transplanted to soil in 20-cm pots .…”

INHERITANCE OF REACTION TO SEVERAL RACES OF CROWN RUST, PUCCINIA CORONATA AVENAE ERIKSS., IN TWO CROSSES INVOLVING UKRAINE OATS

“…The nain control used has been the development of varieties resistant to the pathogen" Sources of resistant germ plasm must be found, and when found, the factors for resistance must be transferred to the commereial varieties of the area concerned. The ease with which such transfers of gerln plasro can be made depends on (1) the nr¡mber of genes involved, (2) This study was undertakenrthereforerto determine (r) the mode of inheritance of the ukraine reaeiion to race 263 and other races of crou¡n rust , (2) (32) reports that crosses within all chromosome number groups are highly comnati-ble, but those between groups are often incompabible. The diploid group, particularly A. strisosa, possesses consid,erabl-e disease resistance, especially to crown rust.…”

Breeding oats for high yield and for resistance to crown rust in India

“…Before a resistant variety can be used profitably as a resistance donor in breeding programmes, it is essential to determine the genetic factors governing resistance to specific races . In other countries attempts have been made in this direction in hexaploid or cultivated oats (MURPHY et al ., 1937 ;WEETMAN, 1942 ;OSLER & HAYES, 1953 ;SIMONS & MURPHY, 1954 ;SIMONS, 1956 ;MCKENZIE & FLEISCHMANN, 1964) in diploid and tetraploid oats (MURPHY et al ., 1958 ;SIMONS et al ., 1959) and their interspecific crosses (BROWN & SHANDS, 1954 ;ZILLINSKY, 1956 ;ZILLINSKY et al ., 1959 ;SADANAGA & SIMONS, 1960) .…”