Abstract
Abstract Senscence is sorghum [ Sorghum bicolor (L.) Moench] is manifested as pre‐mature shedding of the lower plant leaves. This process occurs during grain filling and is much more pronounced in senescent than in nonsenescent cultivars. Since roots are the plant organs responsible for water and nutrient accumulation, it is important to understand their relationship to total plant development. The root development of a senescent and a nonsenescent hybrid grain sorghum was investigated in the field. The purpose of this investigation was to determine the influence of senescence on root distribution of two grain sorghum hybrids. Root samples were collected on approximately biweekly bases to measure their rate of growth and extent of distribution. Samples were collected on both sides of, and perpendicular to the row at 5‐, 15‐, 22.5‐, and 30‐cm intervals to a depth of 105 cm. Root distribution and density were similar for each hybrid 3 weeks after planting (3 June). The nonsenescent hybrid, represented by ‘ Pioneer 42004’, established its aventitious root system earlier than did the senescent hybrid, represented by ‘Pioneer 22516’. Differences were based on visual inspection of the roots and root diameter measurements. Root density of both hybrids increased until grain filling with the senescent cultivars generally exhibiting greater root density. From week 11 (5 August) to week 13 (19 August), both hybrids decreased in root density with a greater decrease noted for the senescent hybrid. The more dramatic decrease in density for the senescent hybrid was also reflected in a lesser grain yield.
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Claims 7
Claim · model-written summary
Root density of both sorghum hybrids increased until grain filling.
- Taxon
- Sorghum bicolor
Sorghum bicolore0 - Outcome
- Root densitye1
- Direction
- increasede1
- Qualifier
- until grain fillinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e1“Root density of both hybrids increased until grain filling with the senescent cultivars generally exhibiting greater root density”
Claim · model-written summary
Senescent sorghum cultivars generally exhibited greater root density.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Material
- senescent cultivarse1
- Outcome
- root densitye1
- Direction
- greatere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e1“Root density of both hybrids increased until grain filling with the senescent cultivars generally exhibiting greater root density”
Claim · model-written summary
The nonsenescent sorghum hybrid Pioneer 42004 established its aventitious root system earlier than the senescent hybrid.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Material
- Pioneer 42004e2
- Outcome
- aventitious root systeme2
- Direction
- earliere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e2“The nonsenescent hybrid, represented by ‘ Pioneer 42004’, established its aventitious root system earlier than did the senescent hybrid”
Claim · model-written summary
Root density of both hybrids decreased from week 11 to week 13.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Outcome
- root densitye3
- Direction
- decreasede3
- Qualifier
- From week 11 (5 August) to week 13 (19 August)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e3“From week 11 (5 August) to week 13 (19 August), both hybrids decreased in root density with a greater decrease noted for the senescent hybrid”
Claim · model-written summary
The root density decrease was greater for the senescent hybrid.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Material
- senescent hybride3
- Outcome
- root densitye3
- Direction
- greater decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e3“From week 11 (5 August) to week 13 (19 August), both hybrids decreased in root density with a greater decrease noted for the senescent hybrid”
Claim · model-written summary
The greater root density decrease of the senescent hybrid was reflected in a lesser grain yield.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Material
- senescent hybride4
- Outcome
- grain yielde4
- Direction
- lessere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e4“The more dramatic decrease in density for the senescent hybrid was also reflected in a lesser grain yield”
Claim · model-written summary
Root distribution and density were similar for each hybrid 3 weeks after planting.
- Taxon
- Sorghum bicolorSorghum bicolore0
- Outcome
- Root distribution and densitye5
- Direction
- similare5
- Qualifier
- 3 weeks after plantinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum [ Sorghum bicolor (L.) Moench]”
e5“Root distribution and density were similar for each hybrid 3 weeks after planting”