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Divergent phenotypic response of rice accessions to transient heat stress during early seed development

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dc.contributor.authorPaul, Puneeten
dc.contributor.authorDhatt, Balpreet K.en
dc.contributor.authorSandhu, Jaspreeten
dc.contributor.authorHussain, Waseemen
dc.contributor.authorIrvin, Larissaen
dc.contributor.authorMorota, Gotaen
dc.contributor.authorStaswick, Paulen
dc.contributor.authorWalia, Harkamalen
dc.date.accessioned2020-05-29T14:25:01Zen
dc.date.available2020-05-29T14:25:01Zen
dc.date.issued2020-01-12en
dc.description.abstractIncreasing global surface temperatures is posing a major food security challenge. Part of the solution to address this problem is to improve crop heat resilience, especially during grain development, along with agronomic decisions such as shift in planting time and increasing crop diversification. Rice is a major food crop consumed by more than 3 billion people. For rice, thermal sensitivity of reproductive development and grain filling is well-documented, while knowledge concerning the impact of heat stress (HS) on early seed development is limited. Here, we aim to study the phenotypic variation in a set of diverse rice accessions for elucidating the HS response during early seed development. To explore the variation in HS sensitivity, we investigated aus (1), indica (2), temperate japonica (2), and tropical japonica (4) accessions for their HS (39/35 degrees C) response during early seed development that accounts for transition of endosperm from syncytial to cellularization, which broadly corresponds to 24 and 96 hr after fertilization (HAF), respectively, in rice. The two indica and one of the tropical japonica accessions exhibited severe heat sensitivity with increased seed abortion; three tropical japonicas and an aus accession showed moderate heat tolerance, while temperate japonicas exhibited strong heat tolerance. The accessions exhibiting extreme heat sensitivity maintain seed size at the expense of number of fully developed mature seeds, while the accessions showing relative resilience to the transient HS maintained number of fully developed seeds but compromised on seed size, especially seed length. Further, histochemical analysis revealed that all the tested accessions have delayed endosperm cellularization upon exposure to the transient HS by 96 HAF; however, the rate of cellularization was different among the accessions. These findings were further corroborated by upregulation of cellularization-associated marker genes in the developing seeds from the heat-stressed samples.en
dc.description.notesThis work was funded by National Science Foundation Grant #1736192 to HW.en
dc.description.sponsorshipNational Science FoundationNational Science Foundation (NSF) [1736192]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1002/pld3.196en
dc.identifier.eissn2475-4455en
dc.identifier.issue1en
dc.identifier.otherUNSP e00196en
dc.identifier.pmid31956854en
dc.identifier.urihttp://hdl.handle.net/10919/98614en
dc.identifier.volume4en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectendospermen
dc.subjectgenetic diversityen
dc.subjectheat stressen
dc.subjectriceen
dc.subjectseed developmenten
dc.subjectsyncytialen
dc.titleDivergent phenotypic response of rice accessions to transient heat stress during early seed developmenten
dc.title.serialPlant Directen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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