The effects of temperature on vegetative and early reproductive growth of a cold tolerant and a cold sensitive line of phaseolus vulgaris 1. nodulation growth and partitioning of dry matter carbon and nitrogen

Thomas, R.J.; Sprent, J.I.

Annals of Botany 53(4): 579-588


ISSN/ISBN: 0305-7364
Accession: 006668353

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Nodulated plants of a cold-sensitive (Seafarer, SF) and tolerant (accession 194) line of P. vulgaris L. were grown under 3 temperature regimes,, and C (light/dark). Dry matter, total C and N were measured in plant parts at 3 harvests. Both lines produced functional nodules at a mean growth temperature as low as C ( but 194 produced more and larger nodules which fixed more N (total plant N) than SF. At the lowest temperature during early vegetative growth, 194 accumulated greater amounts of dry wt than SF but had similar RGR and RGR expressed in terms of N on the other hand, were markedly greater in 194 than SF. 194 Partitioned more dry wt and N into shoots vs. roots and had a lower leaf: stem dry wt ratio than SF. Both lines showed similar increases in leaf area, leaf area ratio and RGR with increasing temperature. The ability to nodulate well, increase nodule size in response to temperature stress and achieve maximum leaf expansion apparently are important factors for the superior growth of 194 over SF.