Interspecific and intergeneric hybrids in herbage grasses - IV. lolium rigidum et al
The present account is concerned with the breeding interactions of annual, normally wind-pollinated types ofLolium.
The plants used were derived from widely separated geographical areas, and the seed samples which they represented were variously named by the senders.
On morphological characteristics the lots represented in the breeding work now described were eventually separated into two main groups:
Lots which could be classified as representingL. rigidum Gaud.
Lots which could not easily be referred to this species owing to morphological divergences but which still varied considerably one lot from another.
Some exceptional results were recorded, but these do not seem to be significant in relation to the intercompatibility of theLolium types and groups involved.
The breeding interactions of plants within group (2) above (referred to in the paper asL. rigidum sens, ampl.) despite their morphological differences gave results consistent with those to be expected in intraspecific breeding.
Similar results were obtained by interbreeding plants of diverse sources of origin but classifiable asL. rigidum Gaud.
Finally, when plants of the two main divisions were intercrossed the results were again consistent with those obtainable in intraspecific breeding.
It is therefore concluded that despite geographical separation and morphological divergences there is no evidence of species differentiation as judged on the basis of inter-fertility in the normally wind-pollinated annualLolium types.
Provided therefore the opportunity occurred and all the conditions were suitable in nature, these various types could interbreed freely.
Volume 100, 2021
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