Abstract
Production of high quality seed corn ( Zea mays L.) would be facilitated by the harvesting of the seed at a kernel maturity which is highly correlated with maximum seedling vigor. This study attempted to correlate several kernel maturity indices with measures of seedling vigor in a maturing seed corn crop. Hybrid seed samples were taken from two field locations of production of maternal parents ‘A632’, ‘Va26’, ‘B73’, and ‘Mo17’ from 35 days to 98 days after silking. Kernel maturity indices evaluated were: 1) fresh kernel respiration rates, 2) black layer development, 3) moisture percentage, and 4) dry weight accumulation. After drying, the seed was grown on moistened, rolled paper towels in the dark for seven days at 25 C. Vigor measurements included germination percentage, shoot dry weight, and root dry weight. Although germination percentages were high over all harvest dates, both shoot and root dry weight were highly dependent on date of harvest. Distinct vigor maxima and minima were noted, and the first and last sample dates never corresponded to maximum shoot and root dry weight. Dates of maximum vigor and kernel maturity patterns were specific for each hybrid. Maximum kernel dry weight was correlated with maximum shoot and root dry weight, and the range of kernel moisture percentage corresponding to initial attainment of maximum kernel dry weight was small.
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Claims 7
Claim · model-written summary
Germination percentages were high across all harvest dates.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although germination percentages were high over all harvest dates”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
Shoot and root dry weight depended strongly on harvest date.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both shoot and root dry weight were highly dependent on date of harvest.”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
Distinct seedling vigor maxima and minima occurred.
- Outcome
- Distinct vigor maxima and minimae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Distinct vigor maxima and minima were noted”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
The first and last sampling dates never produced maximum shoot or root dry weight.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the first and last sample dates never corresponded to maximum shoot and root dry weight.”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
Maximum vigor dates and kernel maturity patterns were hybrid-specific.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dates of maximum vigor and kernel maturity patterns were specific for each hybrid.”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
Maximum kernel dry weight correlated with maximum shoot and root dry weight.
- Organ / stage
- kernele0
- Outcome
- maximum shoot and root dry weighte0
- Direction
- higherinferrede0
- Qualifier
- Maximum kernel dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum kernel dry weight was correlated with maximum shoot and root dry weight”
e1“seed corn ( Zea mays L.)”
Claim · model-written summary
The kernel moisture range at initial maximum kernel dry weight was small.
- Outcome
- range of kernel moisture percentagee0
- Direction
- smalle0
- Qualifier
- initial attainment of maximum kernel dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the range of kernel moisture percentage corresponding to initial attainment of maximum kernel dry weight was small.”
e1“seed corn ( Zea mays L.)”