Abstract
Research in Penn State's Exacum breeding program has revealed genotypic variation for the development of zinc deficiency, which may indicate the presence of zinc efficiency factors. Through preliminary experiments, we have identified both genetic families and individual genotypes that can be classified as either zinc-efficient or zinc-inefficient. Chi-square contingency analyses indicate significant differences ( P < 0.001) in segregation patterns for zinc deficiency among hybrid families. Segregation patterns within families ranged from 100% of the progeny developing zinc deficiency to 100% of the progeny remaining healthy. Two genotypes contrasting in zinc efficiency have been identified and used in experiments designed to investigate physiological factors related to zinc efficiency. The zinc-efficient genotype has a significantly higher ability to decrease solution pH ( P < 0.01), significantly higher root cation exchange capacity ( P < 0.007), significantly lower root/shoot ratio ( P < 0.001), significantly lower water loss/cm 2 leaf ( P < 0.03), and significantly higher fresh weight/dry weight ratio ( P < 0.001). Research on zinc uptake rates is currently being conducted utilizing the efficient and inefficient genotypes. Based on all of our research, we conclude that 1) a strong genetic effect is involved in the zinc nutritional status of interspecific Exacum hybrids and 2) a number of physiological traits differ between zinc-efficient and zinc-inefficient genotypes.
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Claims 8
Claim · model-written summary
Segregation patterns for zinc deficiency differed significantly among Exacum hybrid families.
ExacumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e1“Chi-square contingency analyses indicate significant differences ( P < 0.001) in segregation patterns for zinc deficiency among hybrid families”
Claim · model-written summary
Within Exacum families, segregation for zinc deficiency ranged from 100% of progeny deficient to 100% of progeny healthy.
- Outcome
- Segregation patterns within familiese2
- Value
- 100%e2
- Qualifier
- ranged from 100% of the progeny developing zinc deficiency to 100% of the progeny remaining healthye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e2“Segregation patterns within families ranged from 100% of the progeny developing zinc deficiency to 100% of the progeny remaining healthy”
Claim · model-written summary
The zinc-efficient Exacum genotype had a significantly higher ability to decrease solution pH.
- Material
- zinc-efficient genotypee3
- Outcome
- ability to decrease solution pHe3
- Direction
- significantly highere3
- Qualifier
- P < 0.01e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e3“The zinc-efficient genotype has a significantly higher ability to decrease solution pH ( P < 0.01)”
Claim · model-written summary
The zinc-efficient Exacum genotype had significantly higher root cation exchange capacity.
- Organ / stage
- roote4
- Outcome
- root cation exchange capacitye4
- Direction
- significantly highere4
- Qualifier
- P < 0.007e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e4“significantly higher root cation exchange capacity ( P < 0.007)”
Claim · model-written summary
The zinc-efficient Exacum genotype had a significantly lower root/shoot ratio.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e5“significantly lower root/shoot ratio ( P < 0.001)”
Claim · model-written summary
The zinc-efficient Exacum genotype had significantly lower water loss per cm2 of leaf.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e6“significantly lower water loss/cm 2 leaf ( P < 0.03)”
Claim · model-written summary
The zinc-efficient Exacum genotype had a significantly higher fresh weight/dry weight ratio.
- Material
- zinc-efficient genotypee3
- Outcome
- fresh weight/dry weight ratioe7
- Direction
- significantly highere7
- Qualifier
- P < 0.001e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e3“The zinc-efficient genotype has a significantly higher ability to decrease solution pH ( P < 0.01)”
e7“significantly higher fresh weight/dry weight ratio ( P < 0.001)”
Claim · model-written summary
A strong genetic effect is involved in the zinc nutritional status of interspecific Exacum hybrids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Genotypes of Interspecific Exacum”
e1“a strong genetic effect is involved in the zinc nutritional status of interspecific Exacum hybrids”