Abstract
Plant breeders have noted that corn inbreds and hybrids shovv marked differences in their ability to withstand even mild periods of drouth and high temperatures. Sweet corn inbreds and hybrids as a group do not have as high resistance as field corn in breds and hybrids. The most resistant sweet corn lines are not equal to the most resistant field corn lines. Since 1929, in central Iowa, it has been comparatively easy to classify sweet corn inbreds in the field according to their relative resistance. Less than normal rainfall and higher than normal temperatures during a part of the growing season each year have made possible the classification of the lines into one or more of the following four groups: Those which are subject to (a) tassel firing, (b) firing of the top two or three leaves, (c) firing of the lowest three or four leaves and (d) excessive rolling and wilting of the Ieaves. Plants of lines which are classed in group (d) roll their leaves during periods of high temperature and drouth to the extent that the leaves may fail to unroll entirely when conditions are more favorable. Stunting or death may result.
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Claims 6
Claim · model-written summary
Corn inbreds and hybrids differed markedly in drought and heat tolerance.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- marked differences in their ability to withstand even mild periods of drouth and high temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn inbreds and hybrids shovv marked differences in their ability to withstand even mild periods of drouth and high temperatures”
Claim · model-written summary
Sweet corn inbreds and hybrids were less resistant than field corn inbreds and hybrids.
Verbatim
e0“Sweet corn inbreds and hybrids as a group do not have as high resistance as field corn in breds and hybrids”
Claim · model-written summary
The most resistant sweet corn lines were less resistant than the most resistant field corn lines.
Not reportedDirection
Verbatim
e0“The most resistant sweet corn lines are not equal to the most resistant field corn lines”
Claim · model-written summary
Sweet corn inbreds could be classified by firing and leaf rolling symptoms.
Not reportedComparatorValue
Verbatim
e0“classification of the lines into one or more of the following four groups: Those which are subject to (a) tassel firing, (b) firing of the top two or three leaves, (c) firing of the lowest three or four leaves and (d) excessive rolling and wilting of the Ieaves”
t0“sweet corn”
Claim · model-written summary
Group d plants sometimes failed to unroll their leaves after favorable conditions returned.
Verbatim
e0“Plants of lines which are classed in group (d) roll their leaves during periods of high temperature and drouth to the extent that the leaves may fail to unroll entirely when conditions are more favorable”
t0“sweet corn”
Claim · model-written summary
Stunting or death may follow this leaf rolling.
Verbatim
e0“Stunting or death may result”
t0“sweet corn”