The main features of the ideotype proposed by Donald (1968) for wheat include -
(A) Single, short, strong stem
(B) Erect leaves
(C) Large ear
(D) Absence of awns
(A) Single, short, strong stem
(B) Erect leaves
(C) Large ear
(D) Absence of awns
Show Hint
- (A), (B) and (C) only.
- (A), (B) and (D) only.
- (A), (B), (C) and (D).
- (B), (C) and (D) only.
The Correct Option is A
Solution and Explanation
A crop ideotype, first proposed by Colin Donald in 1968, is a biological model designed to perform predictably and yield high under specific environmental and cultivation conditions.
It defines the ideal morphological and physiological traits a plant should have to maximize yield.
Step 2: Detailed Explanation:
Let us analyze the key traits proposed by Donald for the ideal wheat plant:
- Single, short, strong stem (A): This prevents lodging under high fertilizer application and eliminates non-productive tillers that compete for nutrients and water. (True)
- Erect leaves (B): This leaf arrangement allows sunlight to penetrate deep into the canopy, maximizing photosynthesis across all leaf layers. (True)
- Large ear (C): This maximizes the reproductive sink capacity, allowing the plant to store more grain starch. (True)
- Presence of awns: Donald's ideotype specifies the presence of awns (not their absence, D).
Awns are photosynthetic structures located close to the developing grain. They contribute significantly to grain filling, especially under dry conditions.
Therefore, statements (A), (B), and (C) are correct features of Donald's wheat ideotype.
Step 3: Final Answer:
The correct features are (A), (B), and (C) only, corresponding to option (A).
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