Premium
Flowering and fruiting phenology in the apomictic blackberry, Rubus nessensis (Rosaceae)
Author(s) -
Nybom Hilde
Publication year - 1987
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1987.tb00956.x
Subject(s) - biology , rubus , apomixis , shoot , axillary bud , phenology , botany , sucker , frost (temperature) , rosaceae , inflorescence , horticulture , ploidy , explant culture , anatomy , biochemistry , geomorphology , in vitro , gene , geology
Five stands of an apomictic blackberry, Rubus nessensis , were studied. Biennial shoots flower and fruit in their second year on lateral branches developed from axillary buds. Most premature death of reproductive units occurs by withering of entire laterals, presumably due to damage by frost during the preceeding autumn or winter. Health status of the floricane, assessed as percentage live axillary buds in the spring, was positively correlated with the reproduction parameters. Shoot height as well, is positively correlated with number of flower buds and flowers produced on each lateral but, however, negatively correlated with number of berries, probably because tall shoots tend to suffer more damage by frost which seriously afflicts the vascular tissues of the laterals. The position of the axillary buds on the shoot affects survival and degree of fertility, those situated medially greatly surpassing apical and basal ones.