Abstract
This research aimed to study the effects of packaging materials and storage time on seed viability and chemical component changes during storage. Seed of Rice var. Khao Dawk Mali 105 has been processed and dried to 9.65%moisture( MC). Seeds were stored in 4 different types of plastic bag i.e. Polyamide (PA), Polyethylene (PE), Metallized Polyethylene Terepthalate (MPET) and Woven Polypropylene (WP) bags for a period of 5 months under controlled temperature (16 0 C) and relative humidity (65%) at Seed Center No.7, Chiang Mai. The experiments were designed in 4 × 6 Factorial in RCB (Randomized Completely Block Design) consisting of 2 factors; packaging material and storage period. Changes in seed moisture content, standard germination, vigour and chemical composition (crude carbohydrate, protein and crude fat) were monthly determined. The experiment was conduct from Febuary to July, 2004 at the Postharvest Technology Institute and Department of Agronomy, Faculty of Agriculture, Chiang Mai University. From the experiment, seeds in WP bag were highly changed and gave a higher moisture content percentage (10.40%) than seeds in PA (9.81%), PE (9.83%) and MPET (9.89%) bags throughout storage periods. All treatment showed that rice seeds could maintain their germinability average 95% after 5 months. Rice seeds vigour showed that germination investigated by accelerated aging technique were decreased and the electrical conductivity from seed exudates were increased after 5 months storage (average 92% and 35.55 µmhos/cm/g). The analysis of seed chemical composition showed that all the plastic bag types did not resulted significantly affecting in carbohydrate (85.56%) and protein contents (7.07%), but the fat contents decreased. After 5 months, fat contents in seeds stored in WP bag were lower than MPET, PE and PA bags (1.86, 1.90, 1.97 and 2.01, respectively). The fat contents decreased because of lipase in rice seed and gas oxygen that the main cause seed deterioration. It was concluded that rice seeds stored in PA bag which prevented water vapor and oxygen transmission could delay seed quality deteriorate followed by PE, MPET and WP bags during 5 months storage. 2 Background and Aim of the Study
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Claims 10
Claim · model-written summary
Seeds in WP bags had higher moisture content (10.40%) than seeds in PA bags.
- Taxon
- Rice
Oryza sativae0 - Material
- Khao Dawk Mali 105e0
- Treatment
- WP bage1
- Outcome
- moisture content percentagee1
- Direction
- highere1
- Value
- 10.40%e1
- Comparator
- seeds in PAe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e1“seeds in WP bag were highly changed and gave a higher moisture content percentage (10.40%) than seeds in PA (9.81%), PE (9.83%) and MPET (9.89%) bags”
Claim · model-written summary
Rice seeds maintained an average germinability of 95% after 5 months of storage.
- Taxon
- RiceOryza sativae0
- Outcome
- germinabilitye2
- Value
- average 95%e2
- Qualifier
- after 5 monthse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e2“All treatment showed that rice seeds could maintain their germinability average 95% after 5 months”
Claim · model-written summary
Germination investigated by accelerated aging decreased after 5 months of storage (average 92%).
- Taxon
- RiceOryza sativae0
- Treatment
- 5 months storagee4
- Outcome
- germination investigated by accelerated aging techniquee3
- Direction
- decreasede3
- Value
- average 92%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e3“germination investigated by accelerated aging technique were decreased”
e4“the electrical conductivity from seed exudates were increased after 5 months storage (average 92% and 35.55 µmhos/cm/g)”
Claim · model-written summary
Electrical conductivity from seed exudates increased after 5 months of storage (35.55 µmhos/cm/g).
- Taxon
- RiceOryza sativae0
- Treatment
- 5 months storagee4
- Outcome
- electrical conductivity from seed exudatese4
- Direction
- increasede4
- Value
- 35.55 µmhos/cm/ge4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e4“the electrical conductivity from seed exudates were increased after 5 months storage (average 92% and 35.55 µmhos/cm/g)”
Claim · model-written summary
Plastic bag types did not significantly affect seed carbohydrate content (85.56%).
- Taxon
- RiceOryza sativae0
- Treatment
- plastic bag typese5
- Outcome
- carbohydratee5
- Direction
- no_changeinferrede5
- Value
- 85.56%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e5“all the plastic bag types did not resulted significantly affecting in carbohydrate (85.56%) and protein contents (7.07%)”
Claim · model-written summary
Plastic bag types did not significantly affect seed protein content (7.07%).
- Taxon
- RiceOryza sativae0
- Treatment
- plastic bag typese5
- Outcome
- protein contentse5
- Direction
- no_changeinferrede5
- Value
- 7.07%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e5“all the plastic bag types did not resulted significantly affecting in carbohydrate (85.56%) and protein contents (7.07%)”
Claim · model-written summary
Seed fat content decreased during storage.
- Taxon
- RiceOryza sativae0
- Treatment
- 5 months storagee4
- Outcome
- fat contentse6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e4“the electrical conductivity from seed exudates were increased after 5 months storage (average 92% and 35.55 µmhos/cm/g)”
e6“but the fat contents decreased”
Claim · model-written summary
Seeds in WP bags had lower fat content (1.86%) than seeds in MPET, PE and PA bags after 5 months.
- Taxon
- RiceOryza sativae0
- Treatment
- WP bage7
- Outcome
- fat contentse7
- Direction
- lowere7
- Value
- 1.86, 1.90, 1.97 and 2.01e7
- Comparator
- MPET, PE and PA bagse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed of Rice var. Khao Dawk Mali 105”
e7“fat contents in seeds stored in WP bag were lower than MPET, PE and PA bags (1.86, 1.90, 1.97 and 2.01, respectively)”
Claim · model-written summary
Fat content decreased because of lipase in rice seed and gas oxygen.
- Taxon
- rice seedOryza sativae6
- Outcome
- fat contentse6
- Qualifier
- lipase in rice seed and gas oxygene6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The fat contents decreased because of lipase in rice seed and gas oxygen”
Claim · model-written summary
Storing rice seeds in PA bags could delay seed quality deterioration during 5 months of storage.
- Taxon
- rice seedsOryza sativae6
- Outcome
- delay seed quality deterioratee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“rice seeds stored in PA bag which prevented water vapor and oxygen transmission could delay seed quality deteriorate followed by PE, MPET and WP bags during 5 months storage”
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