Abstract
To study the effects of sowing date and boll position on fiber quality and the physiological mechanism, field experiments were conducted using two cotton cultivars (Kemian 1 and Sumian 15) with two sowing dates (normal sowing date 25 April, and late sowing date 25 May) at Nanjing (118°50′E, 32°02′N), Jiangsu, China, in 2006 and 2007. Cotton bolls were divided into three parts (low, middle and upper) according to the fruiting branch symbodial positions. Boll weight, fiber quality (bundle strength, span lengths, micronaire), and fiber physiological parameters (cellulose content, callose content, and sucrose transformation rate) were detected, respectively. Boll weight and fiber strength were affected by sowing date, boll position, and sowing date × boll position. Comparing to the normal sowing date,late sowing date declined boll weight, fiber strength, cellulose content, and sucrose transformation rate. The cellulose content and sucrose transformation rate changed with boll position and consequently resulted in the change of boll weight and fiber strength. In normal sowing date, cotton boll in middle positional sympodial branch had the highest cellulose content, sucrose transformation rate, boll weight, and fiber strength. In late sowing date, cotton boll in low positional sympodial branch had the highest cellulose content, boll weight and fiber quality. The results indicated that the change of fiber yield and quality in sowing dates and boll positions were because the synthesis of cellulose, callose and sucrose were changed. Increasing the cellulose content and sucrose transformation rate can improve yield and fiber quality in late sowing date or sub-optimal environmental conditions. Key words: Cotton, sowing date, boll position, boll weight, fiber quality, cellulose content, callose content, sucrose transformation rate.
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Claims 10
Claim · model-written summary
Late sowing reduced boll weight.
Not reportedTaxon
Verbatim
e0“Comparing to the normal sowing date,late sowing date declined boll weight, fiber strength, cellulose content, and sucrose transformation rate”
Claim · model-written summary
Late sowing reduced fiber strength.
Not reportedTaxon
Verbatim
e0“Comparing to the normal sowing date,late sowing date declined boll weight, fiber strength, cellulose content, and sucrose transformation rate”
Claim · model-written summary
Late sowing reduced cellulose content.
- Treatment
- late sowing datee0
- Outcome
- cellulose contente0
- Direction
- declinede0
- Comparator
- normal sowing datee0
Not reportedTaxon
Verbatim
e0“Comparing to the normal sowing date,late sowing date declined boll weight, fiber strength, cellulose content, and sucrose transformation rate”
Claim · model-written summary
Late sowing reduced sucrose transformation rate.
- Treatment
- late sowing datee0
- Outcome
- sucrose transformation ratee0
- Direction
- declinede0
- Comparator
- normal sowing datee0
Not reportedTaxon
Verbatim
e0“Comparing to the normal sowing date,late sowing date declined boll weight, fiber strength, cellulose content, and sucrose transformation rate”
Claim · model-written summary
Middle-position bolls had the highest cellulose content and sucrose transformation rate under normal sowing.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- bolle0
- Outcome
- highest cellulose content, sucrose transformation ratee0
- Qualifier
- normal sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In normal sowing date, cotton boll in middle positional sympodial branch had the highest cellulose content, sucrose transformation rate, boll weight, and fiber strength”
Claim · model-written summary
Middle-position bolls had the highest weight and fiber strength under normal sowing.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- bolle0
- Outcome
- boll weight, and fiber strengthe0
- Direction
- higheste0
- Qualifier
- normal sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In normal sowing date, cotton boll in middle positional sympodial branch had the highest cellulose content, sucrose transformation rate, boll weight, and fiber strength”
Claim · model-written summary
Low-position bolls had highest cellulose content under late sowing.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- bolle0
- Outcome
- cellulose contente0
- Direction
- higheste0
- Qualifier
- late sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In late sowing date, cotton boll in low positional sympodial branch had the highest cellulose content, boll weight and fiber quality”
Claim · model-written summary
Low-position bolls had highest weight and fiber quality under late sowing.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- bolle0
- Outcome
- boll weight and fiber qualitye0
- Direction
- higheste0
- Qualifier
- late sowing datee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In late sowing date, cotton boll in low positional sympodial branch had the highest cellulose content, boll weight and fiber quality”
Claim · model-written summary
Changes in cellulose, callose and sucrose synthesis explain fiber yield and quality variation.
Not reportedTaxon
Verbatim
e0“the change of fiber yield and quality in sowing dates and boll positions were because the synthesis of cellulose, callose and sucrose were changed”
Claim · model-written summary
Increasing cellulose and sucrose transformation may improve late-sown cotton yield and quality.
- Outcome
- improve yield and fiber qualitye0
- Qualifier
- late sowing date or sub-optimal environmental conditionse0
Not reportedTaxon
Verbatim
e0“Increasing the cellulose content and sucrose transformation rate can improve yield and fiber quality in late sowing date or sub-optimal environmental conditions”
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