Pollination thoroughness and maternal yield regulation in wild radish, Raphanus raphanistrum (Brassicaceae)

Area of Science:

• Plant reproductive biology
• Plant ecology

Background:

• Resource limitation often causes negative correlations between maternal yield components like fruit and flower production.
• Pollination variability can influence maternal expenditure in plants.

Purpose of the Study:

• To investigate how varying pollination thoroughness affects yield components and plant growth in wild radish (Raphanus raphanistrum).

Main Methods:

• Wild radish plants were grown in a greenhouse and subjected to hand-pollination treatments ranging from 0% to 100% of flowers.
• Yield components, seed size, seed number, and flower production were measured.

Main Results:

• Hand-pollination increased fruit set, but it rarely exceeded 30% even with high pollination levels.
• Increased pollination thoroughness or fruit set resulted in significantly smaller seeds.
• Flower production decreased dramatically with increased pollination thoroughness.
• Seed number per fruit was unaffected by pollination treatment.

Conclusions:

• Pollination thoroughness impacts seed size and flower production in wild radish.
• A potential trade-off exists between maternal fecundity (fruit/seed production) and pollen export (flower number) at the whole-plant level in this species.