Abstract
Main conclusion
The IPK1 genes, which code for 2-kinases that can synthesize Ins(1,2,4,5,6)P5 from Ins(1,4,5,6)P4, are expressed throughout cotton plants, resulting in the highest Ins(1,2,4,5,6)P5 concentrations in young leaves and flower buds.
Abstract
Cotton leaves contain large amounts of Ins(1,2,4,5,6)P5 and InsP6 compared to plants not in the Malvaceae family. The inositol polyphosphate pathway has been linked to stress tolerance in numerous plant species. Accordingly, we sought to determine why cotton and other Malvaceae have such high levels of these inositol phosphates. We have quantified the levels of InsP5 and InsP6 in different tissues of cotton plants and determined the expression of IPK1 (inositol 1,3,4,5,6-pentakisphosphate 2-kinase gene) in vegetative and reproductive tissues. Gossypium hirsutum was found to contain four IPK1 genes that were grouped into two pair (AB, CD) where each pair consists of very similar sequences that were measured together. More IPK1AB is expressed in leaves than in roots, whereas more IPK1CD is expressed in roots than in leaves. Leaves and flower buds have more InsP5 and InsP6 than stems and roots. Leaves and roots contain more InsP5 than InsP6, whereas flower buds and stems contain more InsP6 than InsP5. Dark-grown seedlings contain more InsP5 and InsP6 than those grown under lights, and the ratio of InsP5 to InsP6 is greater in the light-grown seedlings. During 35 days of the life cycle of the third true leaf, InsP5 and InsP6 gradually decreased by more than 50%. Silencing IPK1AB and IPK1CD with Cotton Leaf Crumple Virus-induced gene silencing (VIGS) resulted in plants with an intense viral phenotype, reduced IPK1AB expression and lowered amounts of InsP5. The results are consistent with Ins(1,2,4,5,6)P5 synthesis from Ins(1,4,5,6)P4 by IPK1. This study detailed the central role of IPK1 in cotton inositol polyphosphate metabolism, which has potential to be harnessed to improve the resistance of plants to different kinds of stress.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ITPK:
-
Inositol 1,3,4-trisphosphate 5/6-kinase
- VIGS:
-
Virus-induced gene silencing
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This work was supported by the United States Department of Agriculture, National Institute of Food and Agriculture (Grant No. 67013-21356 2013 to Glenda E. Gillaspy, Imara Y. Perera and Brian Q. Phillippy).
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Phillippy, B.Q., Donahue, J.L., Williams, S.P. et al. Regulation of inositol 1,2,4,5,6-pentakisphosphate and inositol hexakisphosphate levels in Gossypium hirsutum by IPK1. Planta 257, 46 (2023). https://doi.org/10.1007/s00425-023-04080-9
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DOI: https://doi.org/10.1007/s00425-023-04080-9