Comparative studies of C3 and C4Atriplex hybrids in the genomics era: physiological assessments

Abstract

SummaryLeaf anatomy and physiology are characterized in newly generated hybrids between C3 and C4 species of Atriplex, thus re-establishing the classic system exploited by Björkman and colleagues 45 years ago.

A high throughput gas exchange screen for determining rates of photorespiration or regulation of C4 activity

“…This may be of particular interest for high throughput screening to identify C 4 mutants lacking a fully functional CCM, C 2 variants, or populations of C 3 –C 4 hybrids (Oakley et al , 2014). …”

The Evolutionary Origin of C4 Photosynthesis in the Grass Subtribe Neurachninae

“…First, N. lanigera, N. alopecuroidea, and N. queenslandica may have been derived via reversion from an N. muellerilike C 4 ancestor. This is unlikely because unequivocal evidence of reversion from a C 4 state has yet to be presented, and revertants may have poor fitness because they may not readily reacquire a functional C 3 pathway in the M tissue (Christin et al, 2010;Oakley et al, 2014;Bräutigam and Gowik, 2016). In addition, Christin et al (2012) present evidence indicating N. muelleri obtained a C 4 -adapted PEPC gene by lateral transfer from an ancestor of N. munroi.…”

Evolutionary implications of C3–C4 intermediates in the grass Alloteropsis semialata

“…Individuals with intermediate phenotypes might be interpreted as hybrids between C 3 and C 4 individuals. For example, hybrid crosses between C 3 and C 4 Atriplex congeners produce intermediate phenotypes (Osmond et al ; Oakley et al ). However, a hybrid origin of C 3 –C 4 plants is not supported by the genetic data available for A. semialata , as all non‐C 4 accessions sampled so far form a clade distinct from C 4 accessions in both plastid genome and nuclear rDNA phylogenies (Supporting Information Fig.…”