Abstract
High temperature during grain-filling stage is an important yield-limiting factor in wheat. It was reported earlier that a decrease in grain growth under high temperature is associated with a decrease in soluble starch synthase (SSS) activity, as this enzyme is extremely sensitive to high temperature. In attempt to identify thermostable SSS, a maize variety, in which grain development takes place under relatively warmer conditions, was compared with durum and aestivum wheat varieties in the present study. Maize was grown in rabi season so that grain development takes place in an increasing temperature as in wheat. The mean of maximum temperature during grain development period was highest for maize. In spite of such a high temperature exposure during grain development, the maize grains had a remarkably higher (3-4 times high) SSS activity as compared to wheat. Granule bound starch synthase (GBSS) activity was considerably lower than SSS activity, indicating SSS is the major enzyme for starch synthesis. High temperature exposure of excised developing grains showed no significant decrease in SSS activity in maize, whereas, T. aestivum var. Lok Bold showed a significant decrease. The present study reveals an efficient and relatively thermostable SSS in maize var. HQPM7 as compared to wheat, which could possibly be utilized in improving thermotolerance for grain growth in wheat.
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Claims 5
Claim · model-written summary
Maize grain had 3–4 times higher SSS activity than wheat despite high temperature during grain development.
- Organ / stage
- grainse0
- Gene
- SSSe0
- Outcome
- SSS activitye0
- Direction
- highere0
- Value
- 3-4 times highe0
- Comparator
- wheate0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maize grains had a remarkably higher (3-4 times high) SSS activity as compared to wheat”
Claim · model-written summary
GBSS activity was considerably lower than SSS activity.
- Gene
- Granule bound starch synthase (GBSS)e0
- Outcome
- Granule bound starch synthase (GBSS) activitye0
- Direction
- lowere0
- Comparator
- SSS activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Granule bound starch synthase (GBSS) activity was considerably lower than SSS activity”
t0“maize (Zea mays) grains”
Claim · model-written summary
High temperature exposure caused no significant decrease in SSS activity in excised developing maize grains.
- Organ / stage
- developing grainse0
- Treatment
- High temperature exposuree0
- Gene
- SSSe0
- Outcome
- SSS activitye0
- Direction
- no significant decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature exposure of excised developing grains showed no significant decrease in SSS activity in maize”
Claim · model-written summary
High temperature exposure significantly decreased SSS activity in T. aestivum var. Lok Bold developing grain.
- Taxon
- T. aestivume0
- Material
- T. aestivum var. Lok Bolde0
- Organ / stage
- developing grainse0
- Treatment
- High temperature exposuree0
- Outcome
- SSS activitye0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“High temperature exposure of excised developing grains showed no significant decrease in SSS activity in maize, whereas, T. aestivum var. Lok Bold showed a significant decrease.”
Claim · model-written summary
The authors identify maize var. HQPM7 SSS as relatively thermostable compared with wheat.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an efficient and relatively thermostable SSS in maize var. HQPM7 as compared to wheat”
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