Kernel weight responses to the photothermal environment in maize dent × flint and flint × flint hybrids

نویسندگان

چکیده

Maize (Zea mays L.) grain yield is assumed to be source limited during the flowering period but sink growth; however, environmental restrictions active filling may strongly affect final kernel weight (KW). In this study, we evaluated effect of natural changes in photothermal conditions lag phase (LP) and effective grain-filling (EGFP) on KW, its physiological determinants, post-flowering source–sink relationships flint semident germplasm. F1 hybrids × dent background were tested four seasons (Y1, Y2, Y3, Y4). Across years, highest KW (286 mg) was obtained under maximum quotients LP (PTQLP = 1.18 MJ m?2 °C?1) EGFP (PTQEGFP 1.07 whereas smallest (252 ratio lowest PTQEGFP (.79 Y3. Supra-optimum temperatures Y3 negatively affected potential determination, hence growth rate (P < .001) as a result reduced assimilate availability per kernel. Hybrids exhibited higher yield, number, plant around than throughout had relationship .05) increased sensitivity conditions. Results emphasized importance environment determination (particularly for with great imbalance between subphases) well dependency responses genetic background.

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ژورنال

عنوان ژورنال: Crop Science

سال: 2021

ISSN: ['1435-0653', '0011-183X']

DOI: https://doi.org/10.1002/csc2.20481