Abstract
Abstract There have been many investigations into the time interval when maize ( Zea mays L.) yield is most susceptible to stress. Knowledge of this interval is important for understanding yield potential, modeling, irrigation scheduling, and the study of the partitioning of assimilate into grain. The objective of this experiment was to determine the growth stage when shading stress affected number of kernels per ear. Three commercial maize hybrids were grown on a Houston black clay (fine montmorillonitic, thermic Udic Pellustert) under irrigation near Temple, TX in 1982 and 1983. Plants were stressed using horizontal shade panels that reduced the light by 79% for approximately 13‐day intervals. In order to define when number of kernels was affected, the panels were moved three times each week to provide an overlapping series of treatments. The number of kernels of each treated plant was measured and treatment means were compared with unshaded controls. The growth stage when shading decreased the final kernel number was closely associated with early kernel development, occurring near the end of the lag period of grain filling. Duration of the sensitive period varied from 6 to 23 days. It was speculated that a stress applied in the first 1 to 2 weeks after pollination caused a temporary shortage of assimilate for the ear, severely limiting endosperm cell number of some tip kernels. These kernels would not fill later, even if stress was relieved.
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Claims 4
Claim · model-written summary
Shading decreased final maize kernel number near the end of the grain-filling lag period.
- Organ / stage
- early kernel developmente0
- Treatment
- shadinge0
- Outcome
- final kernel numbere0
- Direction
- decreasede0
- Comparator
- unshaded controlse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth stage when shading decreased the final kernel number was closely associated with early kernel development, occurring near the end of the lag period of grain filling”
e1“unshaded controls”
e2“maize ( Zea mays L.)”
Claim · model-written summary
The maize shading-sensitive period lasted 6 to 23 days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Duration of the sensitive period varied from 6 to 23 days”
e1“maize ( Zea mays L.)”
Claim · model-written summary
The authors speculated that early post-pollination stress temporarily reduced assimilate supply and limited endosperm cell number in tip kernels.
- Treatment
- stress applied in the first 1 to 2 weeks after pollinatione0
- Outcome
- endosperm cell numbere0
- Direction
- limitinge0
- Qualifier
- temporary shortage of assimilate for the eare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was speculated that a stress applied in the first 1 to 2 weeks after pollination caused a temporary shortage of assimilate for the ear, severely limiting endosperm cell number of some tip kernels”
e1“maize ( Zea mays L.)”
Claim · model-written summary
The authors speculated that affected tip kernels would not fill after stress relief.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These kernels would not fill later, even if stress was relieved”
e1“maize ( Zea mays L.)”
The same questions in other papers
shade · yield · Zea mays (maize)Results differ
45 papers in the same direction as this paper · 7 in the opposite direction
- positive
- negative
- negative
49 papers more in this group
See all 53 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.