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Will future maize improvement programs leverage the canopy light-interception, photosynthetic, and biomass capacities of traditional accessions?

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dc.contributor.author Mohamed Mubarak, Ahamadeen Nagoor
dc.contributor.author Mufeeth Mohammathu, Mohammathu Musthapha
dc.contributor.author Kumara, Arachchi Devayalage Nishantha Thissa
dc.date.accessioned 2023-04-28T09:36:13Z
dc.date.available 2023-04-28T09:36:13Z
dc.date.issued 2023-04-27
dc.identifier.citation PeerJ 11:e15233 en_US
dc.identifier.issn 2167-8359
dc.identifier.uri https://doi.org/10.7717/peerj.15233
dc.identifier.uri http://ir.lib.seu.ac.lk/handle/123456789/6678
dc.description.abstract Maize germplasm has greater latent potential to address the global food and feed crisis because of its high radiation, water and nutrient efficiencies. Photosynthetic and canopy architectural traits in maize are important in determining yield. The present study aimed to screen a subset of local maize accessions in Sri Lanka to evaluate their photosynthetic, biomass and yield related traits and to identify resource efficient germplasm. Experiments were carried out in the Ampara district of Sri Lanka. Eight maize accessions viz; SEU2, SEU6, SEU9, SEU10, SEU14, SEU15, SEU17 and SEU17 and two elite F1 cultivars (cv. Pacific-999 and cv. Bhadra) were analyzed under field conditions. Our results showed that maize genotypes produced a lower leaf area index (LAI) at the third and tenth week after field planting (WAP). However, the LAI was significantly increased in six WAP by Pacific-999, SEU2, SEU9, and SEU15. A similar trend was observed for percentage of light interception at three WAP (47%), six WAP (>64%), and decreased at 10 WAP. In addition, LAI maximum values were between 3.0 and 3.5, allowing 80% of the incident light to be intercepted by maize canopies. The estimated light extinction coefficient (k) remained lower (<0.5), suggesting that maize leaves are eractophilic canopies. Although fractional interception (f) varies, SEU2 and SEU9 had the highest values (0.57), and quantum yields of PSII (>0.73) in dark-adapted leaves. In addition, Pacific-999, SEU2, SEU9, and SEU17 had significantly higher rates of photosynthesis with minimal stomatal conductance and transpiration rates. As a result, they outperformed the control plants in terms of biomass, cob weight and grain yield. This suggests that native maize germplasm could be introduced as novel, less resource-intensive cultivars to sustain global food security. en_US
dc.language.iso en en_US
dc.subject Chlorophyll content en_US
dc.subject Fractional interception en_US
dc.subject Leaf area index en_US
dc.subject Light extinction coefficient en_US
dc.subject Photosynthetic rates en_US
dc.subject Biomass en_US
dc.subject Grain yield en_US
dc.subject Radiation use efficiency en_US
dc.subject Canopy architecture en_US
dc.subject Water use efficiency en_US
dc.title Will future maize improvement programs leverage the canopy light-interception, photosynthetic, and biomass capacities of traditional accessions? en_US
dc.type Article en_US


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  • Research Articles [915]
    THESE ARE RESEARCH ARTICLES OF ACADEMIC STAFF, PUBLISHED IN JOURNALS AND PROCEEDINGS ELSWHERE

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