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Kim HJ, Kato N, Ndathe R, et al. Evidence for thermosensitivity of the cotton (Gossypium hirsutum L.) immature fiber (im) mutant via hypersensitive stomatal activity. PLoS One. 2021;16(12):e0259562doi: 10.1371/journal.pone.0259562.
Kim, H. J., Kato, N., Ndathe, R., Thyssen, G. N., Jones, D. C., & Ratnayaka, H. H. (2021). Evidence for thermosensitivity of the cotton (Gossypium hirsutum L.) immature fiber (im) mutant via hypersensitive stomatal activity. PloS one, 16(12), e0259562. https://doi.org/10.1371/journal.pone.0259562
Kim, Hee Jin, et al. "Evidence for thermosensitivity of the cotton (Gossypium hirsutum L.) immature fiber (im) mutant via hypersensitive stomatal activity." PloS one vol. 16,12 (2021): e0259562. doi: https://doi.org/10.1371/journal.pone.0259562
Kim HJ, Kato N, Ndathe R, Thyssen GN, Jones DC, Ratnayaka HH. Evidence for thermosensitivity of the cotton (Gossypium hirsutum L.) immature fiber (im) mutant via hypersensitive stomatal activity. PLoS One. 2021 Dec 13;16(12):e0259562. doi: 10.1371/journal.pone.0259562. eCollection 2021. PMID: 34898615; PMCID: PMC8668099.
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PLoS One. 2021 Dec 13;16(12):e0259562. doi: 10.1371/journal.pone.0259562. eCollection 2021.

Evidence for thermosensitivity of the cotton (Gossypium hirsutum L.) immature fiber (im) mutant via hypersensitive stomatal activity.

PloS one

Hee Jin Kim, Naohiro Kato, Ruth Ndathe, Gregory N Thyssen, Don C Jones, Harish H Ratnayaka

Affiliations

  1. USDA-ARS, Southern Regional Research Center, Cotton Fiber Bioscience Research Unit, New Orleans, LA, United States of America.
  2. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, United States of America.
  3. Cotton Incorporated, Cary, NC, United States of America.
  4. Department of Biology, Xavier University of Louisiana, New Orleans, LA, United States of America.

PMID: 34898615 PMCID: PMC8668099 DOI: 10.1371/journal.pone.0259562

Abstract

Thickness of cotton fiber, referred to as fiber maturity, is a key determinant of fiber quality, lint yield, and textile performance. The cotton immature fiber (im) mutant has been used to study fiber maturity since its fiber is thinner than the wild type near isogeneic line (NIL), Texas Marker-1 (TM-1). The im phenotype is caused by a single recessive mutation of a pentatricopeptide repeat (PPR) gene that reduces the activity of mitochondrial complex I and up-regulates stress responsive genes. However, the mechanisms altering the stress responses in im mutant are not well understood. Thus, we characterized growth and gas exchange in im and TM-1 under no stress and also investigated their stress responses by comparing gas exchange and transcriptomic profiles under high temperature. Phenotypic differences were detected between the NILs in non-fiber tissues although less pronounced than the variation in fibers. At near optimum temperature (28±3°C), im maintained the same photosynthetic performance as TM-1 by means of greater stomatal conductance. In contrast, under high temperature stress (>34°C), im leaves reduced photosynthesis by decreasing the stomatal conductance disproportionately more than TM-1. Transcriptomic analyses showed that the genes involved in heat stress responses were differentially expressed between the NIL leaves. These results indicate that the im mutant previously reported to have low activity of mitochondrial complex I displays increased thermosensitivity by impacting stomatal conductance. They also support a notion that mitochondrial complex I activity is required for maintenance of optimal photosynthetic performance and acclimation of plants to high temperature stress. These findings may be useful in the future efforts to understand how physiological mechanisms play a role in determining cotton fiber maturity and may influence stress responses in other crops.

Conflict of interest statement

This research was partially supported by Cotton Incorporated (#19-858). The funder provided supports in the form of research materials, but did not have any role in the study design, data collection a

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