Abstract
Abstract One problem caused by high temperature during ripening in Japonica rice cultivars is a reduction in the amount of starch in the endosperm. To better understand this deleterious effect, we compared the accumulation of the two components of starch, amylose and amylopectin in grains ripened at high (32/28 °C) and low (22/18 °C) day/night temperatures in a set of lines of Japonica cultivar Taichung 65 (T65Wx b ) that are near‐isogenic for the Wx locus, which encodes granule‐bound starch synthase I. In T65Wx b ripened at high temperature, the amount of starch per grain decreased. However, amylose per grain significantly decreased while amylopectin per grain significantly increased. On the other hand, the amount of amylopectin in T65wx, the amylose‐free line, did not differ significantly at the high and low temperatures. These data indicated that high temperatures during ripening did not directly affect amylopectin accumulation in T65Wx b and that the reduction in starch in T65Wx b from the high temperatures was caused by a decrease only of amylose. The results for T65Wx a and T65Wx op were also consistent with this conclusion. As a result of the decrease in amylose, the outer region of starch granules from T65Wx b ripened at the high temperatures also had less I 2 KI staining. Because this fact might suggest that a portion of amylose was synthesized inside the developing granules after amylopectin synthesis in rice, the effect of amylose deposition in increasing of the density of starch granules is also discussed.
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Claims 6
Claim · model-written summary
High temperature reduced starch per grain in T65Wx b.
- Taxon
- Japonica rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupe1 - Material
- T65Wx be0
- Treatment
- high temperaturee0
- Outcome
- amount of starch per graine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
e0“In T65Wx b ripened at high temperature, the amount of starch per grain decreased”
e1“Japonica rice cultivars”
Claim · model-written summary
High temperature significantly reduced amylose per grain.
- Taxon
- Japonica riceOryza sativa Japonica Groupe1
- Treatment
- high temperaturee2
- Outcome
- amylose per graine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“amylose per grain significantly decreased while amylopectin per grain significantly increased”
e1“Japonica rice cultivars”
e2“In T65Wx b ripened at high temperature”
Claim · model-written summary
High temperature significantly increased amylopectin per grain.
- Taxon
- Japonica riceOryza sativa Japonica Groupe1
- Treatment
- high temperaturee2
- Outcome
- amylopectin per graine0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“amylose per grain significantly decreased while amylopectin per grain significantly increased”
e1“Japonica rice cultivars”
e2“In T65Wx b ripened at high temperature”
Claim · model-written summary
Amylopectin in T65wx did not differ significantly across temperatures.
- Taxon
- Japonica riceOryza sativa Japonica Groupe1
- Material
- T65wxe0
- Treatment
- highe0
- Outcome
- amount of amylopectine0
- Direction
- did not differe0
- Comparator
- low temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of amylopectin in T65wx, the amylose‐free line, did not differ significantly at the high and low temperatures”
e1“Japonica rice cultivars”
Claim · model-written summary
High temperature reduced iodine staining of outer starch granules.
- Taxon
- Japonica riceOryza sativa Japonica Groupe1
- Material
- T65Wx be0
- Treatment
- high temperaturese0
- Outcome
- I 2 KI staininge0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the outer region of starch granules from T65Wx b ripened at the high temperatures also had less I 2 KI staining”
e1“Japonica rice cultivars”
Claim · model-written summary
Results for T65Wx a and T65Wx op supported the conclusion that amylose loss caused starch reduction.
- Taxon
- Japonica riceOryza sativa Japonica Groupe1
- Outcome
- resultse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results for T65Wx a and T65Wx op were also consistent with this conclusion”
e1“Japonica rice cultivars”
The same questions in other papers
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See all 40 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.