Theoretical aspects of synthetic/polycross populations of rubber seedlings

Simmonds N. W., . Theoretical aspects of synthetic/polycross populations of rubber seedlings. pp. 1-15. ISSN 0127-7065

Rubber seedlings the products of seed gardens have been grown successfully for decades. Such populations are polycrosses or first generation synthetic varieties (SYN1). The genetics of SYN1 in rubber have not been investigated but some (rather speculative) calculations are possible on fragmentary data. It is likely: that parents are unequally represented among progeny; that crossing is very imperfect but that the deleterious effects of inbreeding are partly mitigated by seedling culling; that nevertheless SYN1 suffers from some inbreeding depression; that second generation seedlings (SYN2) offer interesting practical potential worthy of investigation; and that seed-garden design deserves far more attention that it has had. Suggestions for relevant experiments are made and it is pointed out that isozyme genes would offer a powerful method of analysing the genetical dynamics of seed gardens and their products.

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Abstract

Rubber seedlings the products of seed gardens have been grown successfully for decades. Such populations are polycrosses or first generation synthetic varieties (SYN1). The genetics of SYN1 in rubber have not been investigated but some (rather speculative) calculations are possible on fragmentary data. It is likely: that parents are unequally represented among progeny; that crossing is very imperfect but that the deleterious effects of inbreeding are partly mitigated by seedling culling; that nevertheless SYN1 suffers from some inbreeding depression; that second generation seedlings (SYN2) offer interesting practical potential worthy of investigation; and that seed-garden design deserves far more attention that it has had. Suggestions for relevant experiments are made and it is pointed out that isozyme genes would offer a powerful method of analysing the genetical dynamics of seed gardens and their products.

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Item Type:	Article
AGROVOC Term:	Rubber
AGROVOC Term:	Seedlings
AGROVOC Term:	Synthetic rubber
AGROVOC Term:	Plant population
AGROVOC Term:	Genetics
AGROVOC Term:	Inbreeding
AGROVOC Term:	Pollination
AGROVOC Term:	Yield factors
AGROVOC Term:	Selfing
AGROVOC Term:	Cross pollination
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23590

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