Morpho-physiological traits associated with heat stress tolerance in tropical maize (Zea mays L.) at reproductive stage

dc.creatorNoor, J.J.
dc.creatorVinayan, M.T.
dc.creatorUmar, S.
dc.creatorDevi, P.
dc.creatorIqbal, M.
dc.creatorSeetharam, K.
dc.creatorZaidi, P.H.
dc.date2020-02-15T01:05:21Z
dc.date2020-02-15T01:05:21Z
dc.date2019
dc.date.accessioned2023-07-17T20:05:26Z
dc.date.available2023-07-17T20:05:26Z
dc.identifier1835-2707 (Print)
dc.identifierhttps://hdl.handle.net/10883/20669
dc.identifier10.21475/ajcs.19.13.04.p1448
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7512470
dc.descriptionHeat stress resilience has emerged as an important trait in maize hybrids being targeted for post–monsoon spring cultivation in large parts of South Asia and many other parts of the tropics. Selection based on grain yield alone under heat stress is often misleading, and therefore an approach involving stress-adaptive secondary traits along with grain yield could help in the development of improved, stable heat stress tolerant cultivars. We attempted to identify reliable and effective secondary traits associated with heat stress tolerance in tropical maize and sources of heat stress tolerant germplasm. A panel of 99 elite maize inbred lines representing the wider genetic diversity of tropical maize and a set of 58 elite hybrids were phenotyped under natural heat stress and optimal temperature for grain yield and 15 secondary traits including10 morpho-physiological traits and 5 yield attributes. Evaluation under natural heat stress was done during the spring season by adjusting the planting date in so that the complete reproductive stage (from tassel emergence to late grain filling) was exposed to heat stress. The optimal temperature trial was planted during the monsoon season with no exposure to heat stress at any crop stage. Heat stress significantly affected most of the observed traits. Among the traits studied two yield attributing traits, i.e.- ears per plant (EPP) and kernel per row (KPR), and three morphological traits, i.e.- chlorophyll content (CC), leaf firing (LF) and tassel blast (TB) were found to be the key secondary traits associated with grain yield under heat stress. In addition, low anthesis-silking internal (ASI) is an important trait that needs to be added in the index selection for heat stress tolerance. The study identified nine promising heat stress tolerant maize inbred lines with desirable secondary traits and grain yield under severe heat stress, which could be used as a source of germplasm in heat stress tolerance maize breeding program.
dc.description536-545
dc.formatPDF
dc.languageEnglish
dc.publisherSouthern Cross Publishing Group
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.source4
dc.source13
dc.sourceAustralian Journal of Crop Science
dc.subjectMAIZE
dc.subjectHEAT STRESS
dc.subjectCLIMATE CHANGE
dc.subjectABIOTIC STRESS
dc.titleMorpho-physiological traits associated with heat stress tolerance in tropical maize (Zea mays L.) at reproductive stage
dc.typeArticle
dc.typePublished Version
dc.coverageAustralia


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