Leaf trait covariation and controls on leaf mass per area (LMA) following cotton domestication

Zhangying Lei, Andrea C. Westerband, Ian J. Wright, Yang He, Wangfeng Zhang, Xiaoyan Cai, Zhongli Zhou, Fang Liu*, Yali Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background and Aims: The process of domestication has driven dramatic shifts in plant functional traits, including leaf mass per area (LMA). It remains unclear whether domestication has produced concerted shifts in the lower-level anatomical traits that underpin LMA and how these traits in turn affect photosynthesis.

Methods: In this study we investigated controls of LMA and leaf gas exchange by leaf anatomical properties at the cellular, tissue and whole-leaf levels, comparing 26 wild and 31 domesticated genotypes of cotton (Gossypium).

Key Results: As expected, domesticated plants expressed lower LMA, higher photosynthesis and higher stomatal conductance, suggesting a shift towards the ‘faster’ end of the leaf economics spectrum. At whole-leaf level, variation in LMA was predominantly determined by leaf density (LD) both in wild and domesticated genotypes. At tissue level, higher leaf volume per area (Vleaf) in domesticated genotypes was driven by a simultaneous increase in the volume of epidermal, mesophyll and vascular bundle tissue and airspace, while lower LD resulted from a lower volume of palisade tissue and vascular bundles (which are of high density), paired with a greater volume of epidermis and airspace, which are of low density. The volume of spongy mesophyll exerted direct control on photosynthesis in domesticated genotypes but only indirect control in wild genotypes. At cellular level, a shift to larger but less numerous cells with thinner cell walls underpinned a lower proportion of cell wall mass, and thus a reduction in LD.

Conclusions: Taken together, cotton domestication has triggered synergistic shifts in the underlying determinants of LMA but also photosynthesis, at cell, tissue and whole-leaf levels, resulting in a marked shift in plant ecological strategy.
Original languageEnglish
Pages (from-to)231-243
Number of pages13
JournalAnnals of Botany
Volume130
Issue number2
Early online date16 Jul 2022
DOIs
Publication statusPublished - 1 Aug 2022

Keywords

  • Domestication
  • leaf mass per area
  • cotton
  • wild relatives
  • leaf economics spectrum
  • Gossypium
  • leaf anatomy
  • wild progenitor
  • plant ecology strategy

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  • ARC Centre of Excellence for Plant Success in Nature and Agriculture

    Beveridge, C., Cooper, M., Brodribb, T., Waterhouse, P. M., Wright, I., Bowman, J., Burrage, K., Donovan, D., Foo, E., Jordan, D., Hammer, G., Henry, R., Holland, B., Ortiz-Barrientos, D., Sherman, B., Smith, S., Weller, J., Bett, K., Holbrook, N., Li, J., Lunn, J., Messina, C., Morris, G., Rieseberg, L., Taylor, J. & Trevaskis, B.

    4/12/203/12/27

    Project: Research

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