Question:
The transcription factor SNAC1 (Stress-responsive NAC1) is involved in drought stress response in which of the following crop plants?
The transcription factor SNAC1 (Stress-responsive NAC1) is involved in drought stress response in which of the following crop plants?
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SNAC1 is a NAC-family drought stress transcription factor best known from cereal, grass-family, crop research.
Updated On: Jul 6, 2026
- Sorghum bicolor (sorghum)
- Phaseolus vulgaris (common bean)
- Brassica napus (rapeseed)
- Musa spp (banana)
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The Correct Option is A
Solution and Explanation
Concept:
SNAC1 (Stress-responsive NAC1) belongs to the NAC family of plant transcription factors, proteins that switch on sets of downstream genes when a plant is stressed by drought or high salt.
NAC transcription factors are found across many crop species, but SNAC1 and its drought-tolerance role were most extensively worked out in cereal, grass-family, crops.
Step 1: Recall where SNAC1 function has been characterized.
SNAC1 was shown to be induced strongly by drought stress in guard cells, the cells that control stomatal pores, and overexpressing it improved drought resistance by promoting stomatal closure without harming yield under normal conditions.
This body of work sits within cereal, grass-family crop research, which points toward sorghum among the given options, since sorghum is itself a well known drought-tolerant cereal closely related to the crop group where SNAC1-type NAC genes have been most studied.
Step 2: Rule out the other crops.
Phaseolus vulgaris (common bean) is a legume, and while it has its own drought-responsive NAC genes, they are not the SNAC1 gene referred to here.
Brassica napus (rapeseed) is an oilseed crop from the mustard family, studied for its own separate stress transcription factors, not SNAC1.
Musa spp (banana) is a monocot but not a cereal grain crop, and SNAC1 work is not centered on banana.
Final Answer:
Among the listed crops, sorghum is the cereal crop that best fits the SNAC1 drought-response transcription factor context described. There is some residual uncertainty here since the original SNAC1 characterization work is most closely associated with rice, which is not offered as an option, so sorghum, as the closest related cereal choice, is taken as the intended answer.
\[ \boxed{\text{Sorghum bicolor}} \]
SNAC1 (Stress-responsive NAC1) belongs to the NAC family of plant transcription factors, proteins that switch on sets of downstream genes when a plant is stressed by drought or high salt.
NAC transcription factors are found across many crop species, but SNAC1 and its drought-tolerance role were most extensively worked out in cereal, grass-family, crops.
Step 1: Recall where SNAC1 function has been characterized.
SNAC1 was shown to be induced strongly by drought stress in guard cells, the cells that control stomatal pores, and overexpressing it improved drought resistance by promoting stomatal closure without harming yield under normal conditions.
This body of work sits within cereal, grass-family crop research, which points toward sorghum among the given options, since sorghum is itself a well known drought-tolerant cereal closely related to the crop group where SNAC1-type NAC genes have been most studied.
Step 2: Rule out the other crops.
Phaseolus vulgaris (common bean) is a legume, and while it has its own drought-responsive NAC genes, they are not the SNAC1 gene referred to here.
Brassica napus (rapeseed) is an oilseed crop from the mustard family, studied for its own separate stress transcription factors, not SNAC1.
Musa spp (banana) is a monocot but not a cereal grain crop, and SNAC1 work is not centered on banana.
Final Answer:
Among the listed crops, sorghum is the cereal crop that best fits the SNAC1 drought-response transcription factor context described. There is some residual uncertainty here since the original SNAC1 characterization work is most closely associated with rice, which is not offered as an option, so sorghum, as the closest related cereal choice, is taken as the intended answer.
\[ \boxed{\text{Sorghum bicolor}} \]
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