Abstract
A field experiment was conducted on the farm of Res. Sta. Coll. of Agric. Univ. of Baghdad during 2018-2020. The experiment involved 26 recently developed maize crosses plus an adopted check hybrid. Fall planting of maize in Iraq gives higher yield than spring planting, but it is confronted with high grain moisture at harvest (30-40%) through the rain season. The main goals of this experiment were; to have crosses of low grain moisture, high grain yields, and harvesting before rain season. Seeds were planted about 10 days earlier than recommended, and harvested at mid-October. There were heat tolerant, semi-tolerant and sensitive crosses. The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74. Other crosses were either semi-tolerant or heat sensitive. It was concluded that high heat temperatures (45-55c) has negative impact on many growth parameters, enzyme activity, DNA damage, and microsporogenesis and/or microgametogenesis. Maize genotypes still have excellent opportunity to breed for high temperature and other abiotic stresses. Gene transfer will not be helpful as evaluation and screening if genetically diversed genotypes. Such plants characteristics could be controlled by hundreds of not thousands of genes. Cycles of reselection on some individual unique plants inbred population will be helpful to have new genetic variations in maize germplasm.
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Claims 11
Claim · model-written summary
pio3×60L was identified among the five most heat tolerant maize crosses.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74”
Claim · model-written summary
60 frc × J1 was identified among the five most heat tolerant maize crosses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74”
Claim · model-written summary
17A×J2 was identified among the five most heat tolerant maize crosses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74”
Claim · model-written summary
Pio3 × B74 was identified among the five most heat tolerant maize crosses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74”
Claim · model-written summary
4f6×B74 was identified among the five most heat tolerant maize crosses.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The top five heat tolerant crosses were;1-pio3×60L, 2-60 frc × J1, 3-17A×J2, 4-Pio3 × B74 and 5-4f6×B74”
Claim · model-written summary
The other maize crosses were semi-tolerant or heat sensitive.
- Outcome
- semi-tolerant or heat sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Other crosses were either semi-tolerant or heat sensitive”
Claim · model-written summary
The authors concluded that 45-55c heat negatively affects maize growth parameters.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“high heat temperatures (45-55c) has negative impact on many growth parameters, enzyme activity, DNA damage, and microsporogenesis and/or microgametogenesis”
Claim · model-written summary
The authors concluded that 45-55c heat negatively affects maize enzyme activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“high heat temperatures (45-55c) has negative impact on many growth parameters, enzyme activity, DNA damage, and microsporogenesis and/or microgametogenesis”
Claim · model-written summary
The authors concluded that 45-55c heat negatively affects maize DNA damage.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“high heat temperatures (45-55c) has negative impact on many growth parameters, enzyme activity, DNA damage, and microsporogenesis and/or microgametogenesis”
Claim · model-written summary
The authors concluded that 45-55c heat negatively affects maize microsporogenesis and/or microgametogenesis.
- Treatment
- high heat temperatures (45-55c)e0
- Outcome
- microsporogenesis and/or microgametogenesise0
- Direction
- negative impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“high heat temperatures (45-55c) has negative impact on many growth parameters, enzyme activity, DNA damage, and microsporogenesis and/or microgametogenesis”
Claim · model-written summary
The authors recommend cycles of reselection of unique inbred maize plants to generate new variation.
- Outcome
- Cycles of reselection on some individual unique plants inbred populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Cycles of reselection on some individual unique plants inbred population will be helpful to have new genetic variations in maize germplasm”
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