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    • Journal of Range Management, Volume 43 (1990)
    • Journal of Range Management, Volume 43, Number 4 (July 1990)
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    Nonstructural carbohydrates and spring regrowth of two cool-season grasses: Interaction of drought and clipping

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    Author
    Busso, C. A.
    Richards, J. H.
    Chatterton, N. J.
    Issue Date
    1990-07-01
    Keywords
    carbohydrate metabolism
    stress response
    irrigated conditions
    shoot pruning
    Pseudoroegneria spicata
    Agropyron desertorum
    shoots
    spring
    regrowth
    drought
    defoliation
    water stress
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    Citation
    Busso, C. A., Richards, J. H., & Chatterton, N. J. (1990). Nonstructural carbohydrates and spring regrowth of two cool-season grasses: Interaction of drought and clipping. Journal of Range Management, 43(4), 336-343.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644900
    DOI
    10.2307/3898928
    Additional Links
    https://rangelands.org/
    Abstract
    The role that accumulated carbohydrates play in plant regrowth has been discussed for over 60 years. However, few quantitative studies have been published on the importance of carbohydrates for regrowth in early spring after plants have been exposed to periods of either drought or drought plus defoliation. We examined the relationship between total nonstructural carbohydrate (TNC) concentrations and pools (biomass X concentration) and spring regrowth for crested wheatgrass [Agropyron desertorum Fisch. ex Link) Schult.] and bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) A. Love ssp. Spicata; Syn. A. spicatum (Pursh) Scribn. and Smith] with and without clipping under drought, natural, and irrigated conditions. In spring 1985 and early spring 1986, after 1 or 2 years of clipping, crown and root TNC concentrations an IT NC pools per tiller were generally similar for clipped and unclipped plants of both species. Nonstructural carbohydrate concentrations in crowns and roots did not relate to rate or total production of dark regrowth in mid-spring 1985 and early spring 1986. In early spring 1986 following 2 years of repeated treatments, crown and root TNC pools were on average 7 times higher under drought, in both clipped and unclipped plants, than they were under the higher moisture-level treatments for both species. The large pools of TNC in drought-treated plants appeared to enhance the production of dark regrowth when meristematic limitations on growing tillers did not exist in early spring. These results suggest that plants exposed to prolonged periods of drought or drought plus defoliation may have rapid initial regrowth upon alleviation of these stresses because high amounts of TNC may have accumulated in their storage organs during stress. In addition, the results suggest that high TNC availability facilitates growth only when meristematic activity is high.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898928
    Scopus Count
    Collections
    Journal of Range Management, Volume 43, Number 4 (July 1990)

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