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By L. R. Humphreys

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Extra resources for Environmental Adaptation of Tropical Pasture Plants

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This type of response is not easily explicable in terms of the expected phytochrome transformations. The SO response is sometimes assumed to depend on the conversion ofP 730 (which inhibits FI in SO plants) to the inactive P660 in the hours of darkness. However, this conversion rate is temperature dependent (Heide, 1977) and some other explanation must be sought for the promotive effect of cool temperature. Temperature controls the speed of development of the inflorescence from FI to FA. 2 the duration of the period from FI to FA was reduced across all S.

Seedlings from the selfed plants were weak and abnormal. Some seedlings from seed produced on the double recessive, anthocyanin-free C. 1. 33193 (Bogdan, 1963) contained pigmented areas when grown in a nursery with other lines, which indicates that cross-fertilisation had taken place. Seed produced from four open-pollinated plants of cv. Samford was used to provide seedlings for comparison with clonal material of the parent plants (Jones and Pritchard, 1971). 1 varied by a factor of 5. Progeny variation was considerably greater than variation within material from an individual parent, which suggested that segregation was occurring.

3 S. guianensis M-A groups S. hamata M-A groups humilis M-A groups and subgroups s. Ox Oxley C E S V Cook Endeavour Schofield Verano Climatic background of some of the Stylosanthes M-A groups and cultivars (Burt and Williams, 1975). guianensis. The major dichotomy in the third group related to rainfall: S. hamata, S. fruticosa, S. subsericea and S. erecta came from generally drier (and hotter) areas than S. viscosa and S. scabra. 3 (Burt and Williams, 1975). The S. guianensis groups occur in moister situations than S.

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