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Dry Matter Accumulation Patterns in Indeterminate Phaseolus vulgaris L. Cultivars¹

It has not been determined how extent of continued vegetative growth after flowering in dry bean (Phaseolus vulgaris L.) affects yield potential. Since indeterminate dry bean cultivars range in stature from short and erect to tall vines, it is important to determine to what extent continued shoot elongation after flowering influences dry matter partitioning into developing pods. ‘Monteigao Fosco’ (MF), ‘Rico 23’ (R₂₃), and ‘Ricopardo’ (RP) are erect, semi-erect, and vining indeterminate cultivars, respectively, with approximately equal maturity dates. Central leader length, total shoot length, numbers of lateral shoots, nodes, flowers, pods, and leaves, and dry wt of shoots, leaves, and pods were determined for each cultivar at biweekly sampling dates beginning at the second trifoliate leaf stage and continuing until maturity. At initial flowering, MF, R₂₃, and RP had reached 88, 46, and 57% of central leader length, 53, 53, and 31% of total shoot growth, and subsequently developed two, six, and seven additional nodes, respectively. MF developed more lateral shoots than both R₂₃ and RP. Despite these variations in growth habit, dry matter accumulation patterns were similar for the three cultivars, suggesting that plant type may not be an important factor in determining yield potential.

Key Words: Dry bean • Shoot elongation • Shoot • node • flower and pod number • Dry weight accumulation

² Assistant professor in horticulture, Purdue Univ., West Lafayette, IN 47907. The study was conducted while the author was on leave at the Federal University of Vicosa, Vicosa, M.G., Brazil.

Received for publication September 21, 1977.