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Effect of pollen limitation, additional nutrients, flower position and flowering phenology on fruit and seed production in Salvia verbenaca (Lamiaceae)
Author(s) -
Navarro Luis
Publication year - 1998
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.1756-1051.1998.tb01521.x
Subject(s) - biology , inflorescence , ovule , pollen , phenology , outcrossing , botany , population , horticulture , agronomy , demography , sociology
Variation in fruit set, seed/ovule ratio and mean single‐seed weight among plants, and within plants among inflorescences, was investigated in a population of Salvia verbenaca in northwest Spain. Mean single‐seed weight varied significantly among plants which flowered at about the same time and mean single‐seed weight was significantly greater for plants that flowered late in the season than for plants flowering early in the season. Within individual plants, mean single‐seed weight increased steadily between the earlier opening basal inflorescences and the later opening upper inflorescences. However, neither fruit set nor seed/ovule ratio varied significantly among inflorescences. Previous work on this population indicates that outcrossing improves mean single‐seed weight, so I suggest that the observed pattern of among‐inflorescence variation in mean single‐seed weight may be attributable to a gradual increase in nonself pollen receipt as the flowering season progresses.