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Accueil du site → Master → Etats Unis → 1983 → MATERNAL REPRODUCTIVE INVESTMENT IN THE DESERT ANNUAL LESQUERELLA GORDONII : REGULATION AND PATTERNS

University of Arizona (1983)

MATERNAL REPRODUCTIVE INVESTMENT IN THE DESERT ANNUAL LESQUERELLA GORDONII : REGULATION AND PATTERNS

Delph, Lynda Ferrell

Titre : MATERNAL REPRODUCTIVE INVESTMENT IN THE DESERT ANNUAL LESQUERELLA GORDONII : REGULATION AND PATTERNS.

Auteur : Delph, Lynda Ferrell.

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1983

Résumé
This study examines the factors limiting the maternal repro ductive output in the self-incompatible annual, Lesquerella gordonii Fruits were not aborted and matured if they contained at least one fertilized ovule. Pollen addition did not increase the number of fruit or seeds per fruit, suggesting that fruit and seed production was not pollinator limited. Addition of water increased fruit pro duction by extending the fruit maturation season, by increasing the number of stalks which flowered, and by increasing the number of seeds per fruit. This indicates that fruit and seed production are resource limited. Fifty-three percent of the plants were lost to predators as were 64.6% of the fruits on the remaining plants. In summary : (1) all flowers become fruit ; (2) number of stalks which flower and number of seeds are adjusted according to resource levels, and ; (3) fruits contain a low but variable number of seeds. I suggest that these patterns are adaptations to variable resource levels and high predation risk.

Mots clés : Annuals (Plants) — Reproduction. ; Lesquerella gordonii — Reproductio

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