ATTERNS AND LEVELS OF POLLEN-MEDIATED GENE FLOW IN LATHYRUS LATIFOLIUS

Area of Science:

• Ecology
• Evolutionary Biology
• Plant Science

Background:

• Gene flow is crucial for evolution, but direct measurements in plants are scarce.
• Most studies focus on gene movement in crops or artificial settings, limiting understanding of natural populations.

Purpose of the Study:

• To quantify pollen movement and gene flow in natural populations of Lathyrus latifolius.
• To investigate mating patterns, outcrossing rates, and immigration in a bumblebee-pollinated legume.

Main Methods:

• Utilized fractional paternity analysis to track pollen movement over two years in two distinct sites.
• Studied semi-discrete flowering patches with varying numbers of genotypes within Lathyrus latifolius populations.

Main Results:

• Gene movement distributions deviated significantly from random mating expectations, with a mean gene movement of 14 meters.
• An average of 17.6% of matings occurred within flowering patches, and outcrossing rates ranged from 0.87 to 0.90.
• Immigration rates varied between years and were inversely related to flowering plant density, with significant individual plant heterogeneity in mating patterns.

Conclusions:

• Mating patterns in Lathyrus latifolius are influenced by patch structure and plant density, deviating from random mating.
• Individual plants exhibit unique outcrossing and immigration rates, highlighting the idiosyncratic nature of mating systems.
• Pollen flow dynamics are complex, affected by environmental factors like plant density and potentially influencing evolutionary trajectories.