In wide interspecific crosses (e.g., Solanum, Phaseolus, and Cucurbita distant hybridizations), endosperm degeneration and subsequent hybrid embryo abortion predominantly occur between 6 to 25 days after pollination.
To overcome this hybridization barrier, immature hybrid embryos must be excised and rescued in vitro on nutrient culture medium within this critical 6–25 day window.
Correct Option: Option 1 (6 to 25 days).
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17
ICAR JRF Vegetable Science 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What should be the maternal to paternal endosperm balance number (EBN) ratio in hybrid endsosperm for normal
endosperm development in potato?
The central cell contributes two maternal genomes while the pollen tube delivers one paternal sperm nucleus ($2\text{m} : 1\text{p}$). Any deviation from $2 : 1$ causes endosperm breakdown and embryo lethality.
Correct Option: Option 4 (2:1).
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