Question:
Which of the following researcher has first described gametophytic system of self-incompatibility?
Which of the following researcher has first described gametophytic system of self-incompatibility?
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Remember:
- Gametophytic SI = East and Mangelsdorf (1925)
- Sporophytic SI = Hughes and Babcock Gerstel (1950)
Updated On: Jul 10, 2026
- East and Mangelsdorf (1925)
- Hughes and Babcock (1950)
- Lewis (1954)
- Gerstel (1950)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Self-incompatibility (SI) is a genetic mechanism in flowering plants that prevents self-fertilization by recognizing and rejecting self-pollen.
The two primary genetic classes of SI are Gametophytic Self-Incompatibility (GSI) and Sporophytic Self-Incompatibility (SSI).
Step 2: Detailed Explanation:
- East and Mangelsdorf (1925): First discovered and described the Gametophytic Self-Incompatibility (GSI) system in Nicotiana sanderae.
In GSI, the incompatibility phenotype of the pollen grain is determined by its own haploid S-genotype.
- Hughes and Babcock (1950) and Gerstel (1950): Independently discovered and described the Sporophytic Self-Incompatibility (SSI) system in Crepis foetida and Parthenium argentatum, respectively.
In SSI, the pollen behavior is governed by the diploid genotype of the parent plant (the sporophyte) that produced it.
Step 3: Final Answer:
The gametophytic self-incompatibility system was first described by East and Mangelsdorf in 1925.
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