Singhal Yash Kumar, Boyle Julia Anne, Stinchcombe John R
Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada.
Department of Ecology and Evolutionary Biology, University of Michigan-Ann Arbor, Ann Arbor, Michigan, United States.
MicroPubl Biol. 2025 Mar 24;2025. doi: 10.17912/micropub.biology.001528. eCollection 2025.
Intraspecific variation in leaf shape affects many physiological processes but its impact on plant distribution is underexplored. Using a common garden, we studied daytime thermoregulation of lobed and entire leaf genotypes of which displays a latitudinal leaf shape cline. Both leaf shapes maintained similar temperatures but entire leaf genotypes had significantly increased stomatal conductance in warmer/sunnier weather. With less potential water loss, lobed genotypes may have advantages in drier conditions. Lobed genotypes are more common in the north of the species' range, which receives less summer precipitation, suggesting water availability as a potential clinally varying selective agent.
叶片形状的种内变异影响许多生理过程，但其对植物分布的影响尚未得到充分研究。我们利用一个共同花园，研究了具有纬度叶形渐变的浅裂叶和全缘叶基因型的白天温度调节。两种叶形维持相似的温度，但在天气较暖和/阳光较充足时，全缘叶基因型的气孔导度显著增加。由于潜在水分损失较少，浅裂叶基因型在较干燥条件下可能具有优势。浅裂叶基因型在该物种分布范围的北部更为常见，那里夏季降水量较少，这表明水分可利用性是一种潜在的随梯度变化的选择因子。
