In cauliflower Brassica oleracea L. var. botrytis cv. Kibo Giant, patterns of seed abortion and development within developing siliques are nonrandom. All ovules were fertilized from 14 days after anthesis. However, only 70% of the ovules produced mature seeds. Cryptic seed abortion started early in silique ontogeny and reached a maximum at 28 days after anthesis. Ovules located in the middle zone of a silique produced more mature seeds than ovules in stylar and basal zones in that order. Ovules in the first three positions in the stylar zone (positions 1, 2, and 3) and ovules in the last four positions in basal zone (positions 19, 20, 21, and 22) showed higher rates of seed abortion. The nonrandom pattern of seed abortion within a silique is mainly due to partiality in the allocation of maternal resources to the developing ovules at different positions, which enhances maternal fecundity through resource conservation. It may also be due to temporal differences in fertilization, spatial advantage of seeds within the ovary, and superiority of the parental lineage.Key words: Brassica oleracea L. var. botrytis, seed development, seed abortion, maternal regulation, seed to ovule ratio.
In an attempt to screen the most effective rhizobial strain for the potential cold-climate legume crop beach pea (Lathyrus maritimus L.), rhizobia from eight different species of Lathyrus were tested along with the native strain on a 9-wk-long pot culture. The native strain, ACCCRC, isolated from beach pea proved to be the most effective. The tropical legume grass pea (L. sativus L.) tested with the above strains failed to nodulate with ACCCRC, USDA 2422 and USDA 2446. Oleosome content of nodules assessed from histological sections reveals higher numbers in beach pea than in grass pea. Un essai de culture en pot de 9 semaines a été réalisé dans le but de découvrir les souches de Rhizobiums les plus efficaces pour la gesse maritime (Lathyrus maritimus L.). Cette légu-mineuse de climat froid offre des possibilités intéressantes comme culture fourragère. Des rhizobiums inféodés à huit espèces différentes de Lathyrus étaient testés en comparaison avec la souche indigène. C'est dernière, désignée ACCCRC, isolée à partir de la gesse maritime qui s'est révélée la plus efficace. La gesse cultivée, espèce subtropicale testée en présence des 9 souches cidessus n'a pas donné de nodulation en présence de ACCCRC, USDA 2422 et USDA 2446. Le contenu en oléosomes des nodosités examinées sur coupes histologiques était plus abondant chez la gesse maritime que chez la gesse cultivée.
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