Evolutionary diversification of C2 photosynthesis in the grass genus Homolepis (Arthropogoninae).

ABSTRACT:

Background and aims

To better understand C4 evolution in monocots, we characterized C3-C4 intermediate phenotypes in the grass genus Homolepis (subtribe Arthropogoninae).

Methods

Carbon isotope ratio (δ13C), leaf gas exchange, mesophyll (M) and bundle sheath (BS) tissue characteristics, organelle size and numbers in M and BS tissue, and tissue distribution of the P-subunit of glycine decarboxylase (GLDP) were determined for five Homolepis species and the C4 grass Mesosetum loliiforme from a phylogenetic sister clade. We generated a transcriptome-based phylogeny for Homolepis and Mesosetum species to interpret physiological and anatomical patterns in an evolutionary context, and to test for hybridization.

Key results

Homolepis contains two C3 species (H. glutinosa, H.

SUBMITTER: Alvarenga JP 

PROVIDER: S-EPMC11904902 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature