Estimating organ contribution to grain filling and potential for source upregulation in wheat cultivars with a contrasting source-sink balance

dc.creatorRivera Amado, A.C.
dc.creatorMolero, G.
dc.creatorTrujillo, E.
dc.creatorReynolds, M.P.
dc.creatorFoulkes, M.J.
dc.date2021-01-13T01:20:14Z
dc.date2021-01-13T01:20:14Z
dc.date2020
dc.date.accessioned2023-07-17T20:06:38Z
dc.date.available2023-07-17T20:06:38Z
dc.identifierhttps://hdl.handle.net/10883/21110
dc.identifier10.3390/agronomy10101527
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7512896
dc.descriptionGrain filling may be limited by the joint source and sink capacity in modern wheat cultivars, indicating a need to research the co-limitation of yield by both photosynthesis and the number and potential size of grains. The extent to which the post-anthesis source may be limiting final grain size can be estimated by partial degraining of spikes, while defoliation and shading treatments can be useful to estimate if any excess photosynthetic capacity exists. In the current study, degraining was applied to a set of 26 elite spring wheat cultivars from the International Maize and Wheat Improvement Center (CIMMYT)'s core germplasm (CIMCOG) panel, while lamina defoliation and shading through stem-and-leaf-sheath covering treatments were applied to a subset of the same cultivars. Responses to source treatments in grain weight, pre-anthesis reserve contribution to grain weight, dry-matter translocation efficiency, and flag-leaf and spike photosynthetic rate were measured and compared to an unmanipulated control treatment. Grain weight responses to degraining among cultivars ranged from no response to increases of 28%, suggesting a range of responses from sink limitation, to probable source and sink co-limitation of grain growth. Grain weight's response to degraining increased linearly with the years of cultivar release from 1966 to 2009, indicating that the current highest yield potential CIMMYT spring wheats have a co-limitation of grain growth by source and sink. This may have been due to an increase in grain sink strength with years of cultivar release with no commensurate increase in post-anthesis source capacity. The relatively low decreases in grain weight with defoliation compared to decreases in light interception by defoliation indicated that sink limitation was still likely predominating in the cultivars with co-limitation. The stem-and-leaf-sheath covering treatment decreased grain weight by nearly 10%, indicating that stem-and-leafsheath photosynthesis plays a key role in grain growth during grain filling. In addition, pre-anthesis reserve contribution to grain weight was increased by ca. 50% in response to lamina defoliation. Our results showed that increasing the post-anthesis source capacity, through increases in stem-and-leaf-sheath photosynthetic rate during grain filling and pre-anthesis reserve contribution to grain weight, is an important objective in enhancing yield potential in wheat through maintaining a source-sink balance.
dc.languageEnglish
dc.publisherMDPI
dc.relationhttps://www.mdpi.com/2073-4395/10/10/1527#supplementary
dc.rightsCIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
dc.rightsOpen Access
dc.source10
dc.source10
dc.source2073-4395
dc.sourceAgronomy
dc.source1527
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectPhotosynthetic Capacity
dc.subjectSource-Sink Balance
dc.subjectDegraining
dc.subjectPHOTOSYNTHESIS
dc.subjectSOURCE SINK RELATIONS
dc.subjectDEFOLIATION
dc.subjectSEED FILLING
dc.titleEstimating organ contribution to grain filling and potential for source upregulation in wheat cultivars with a contrasting source-sink balance
dc.typeArticle
dc.typePublished Version
dc.coverageBasel (Switzerland)


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