Registration of Tx714 Maize Germplasm Line

Betrán, F. J.; Bockholt, A. J.; Fojt, F.; Mayfield, Kerry; Pietsch, D.

doi:10.2135/cropsci2004.1028

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…For aflatoxin resistance, the best testcrosses ( Table 7 ) were numerically better but generally not significantly different from most of the checks (data not shown) in every environment; this is likely because the tester selected, Tx714, has very high aflatoxin susceptibility, which was anticipated to identify inbreds with non-recessive forms of resistance [ 69 ]. However, aflatoxin values for many lines demonstrated an aflatoxin susceptibility statistically greater than the commercial checks; overall BLUPs from Eq.…”

Section: Resultsmentioning

confidence: 99%

“…An association mapping panel comprised of subsets of the USDA Goodman maize association panel (302 lines, [ 49 ]) and the diverse Southern subtropical focused Williams/Warburton panel (300 lines, [ 67 ]) was assembled for a total of 400 lines [ 68 ]. Of the 400 lines, 346 produced sufficient seed in testcrosses to Tx714 [ 69 ] in a summer and fall nursery in College Station, TX and Weslaco, TX, respectively in both 2010 and 2011. The hybrids were evaluated in two separate replicates in a randomized complete block design (RCBD) under irrigated and non-irrigated treatments with commercial checks randomly assigned in the field.…”

Section: Methodsmentioning

confidence: 99%

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Genome Wide Association Study for Drought, Aflatoxin Resistance, and Important Agronomic Traits of Maize Hybrids in the Sub-Tropics

et al. 2015

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The primary maize (Zea mays L.) production areas are in temperate regions throughout the world and this is where most maize breeding is focused. Important but lower yielding maize growing regions such as the sub-tropics experience unique challenges, the greatest of which are drought stress and aflatoxin contamination. Here we used a diversity panel consisting of 346 maize inbred lines originating in temperate, sub-tropical and tropical areas testcrossed to stiff-stalk line Tx714 to investigate these traits. Testcross hybrids were evaluated under irrigated and non-irrigated trials for yield, plant height, ear height, days to anthesis, days to silking and other agronomic traits. Irrigated trials were also inoculated with Aspergillus flavus and evaluated for aflatoxin content. Diverse maize testcrosses out-yielded commercial checks in most trials, which indicated the potential for genetic diversity to improve sub-tropical breeding programs. To identify genomic regions associated with yield, aflatoxin resistance and other important agronomic traits, a genome wide association analysis was performed. Using 60,000 SNPs, this study found 10 quantitative trait variants for grain yield, plant and ear height, and flowering time after stringent multiple test corrections, and after fitting different models. Three of these variants explained 5–10% of the variation in grain yield under both water conditions. Multiple identified SNPs co-localized with previously reported QTL, which narrows the possible location of causal polymorphisms. Novel significant SNPs were also identified. This study demonstrated the potential to use genome wide association studies to identify major variants of quantitative and complex traits such as yield under drought that are still segregating between elite inbred lines.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Genome Wide Association Study for Drought, Aflatoxin Resistance, and Important Agronomic Traits of Maize Hybrids in the Sub-Tropics

et al. 2015

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“…Seven of the lines, including Ark536, B73, B104, CML325 and NC280, were developed by public programmes outside of Texas. Six of the Texas AgriLife lines have been released (Betrán et al. 2004a–c, Llorente et al.…”

Section: Methodsmentioning

confidence: 99%

Genetic Variation for Maize Epicuticular Wax Response to Drought Stress at Flowering

Meeks

Murray

Hague

et al. 2011

J Agronomy Crop Science

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Drought stress is thought to promote epicuticular wax accumulation on maize leaves, which reduces plant water loss. We evaluated 62 maize inbred lines and their hybrid testcross progeny for epicuticular wax accumulation on flag leaves at flowering under full and limited irrigation regimes. Extracted wax was measured as a percentage of wax weight to leaf weight (WLW) and leaf area (WLA). Eleven genotypes had above average WLW as both inbred lines and hybrid testcrosses. Thirteen genotypes had above average WLA as either inbred lines or hybrid testcrosses. The drought treatment did not significantly alter WLW or WLA. Heritability of WLW was 0.17 (inbred lines) and 0.58 (hybrid testcrosses). Heritability of WLA was 0.41 (inbred lines) and 0.59 (hybrid testcrosses), suggesting it is a better trait than WLW for epicuticular wax screening. Correlations (r) between inbred lines and their testcross progeny were 0.44 and 0.18, for WLW and WLA, respectively. Heritability of grain weight per ear and plot yield was highest in hybrid testcrosses, with no correlation between inbred and hybrid germplasm. It is not warranted to evaluate epicuticular wax accumulation as the sole drought tolerance mechanism. However, it may be a good secondary trait to observe in relation to grain yield production in hybrids tested under water‐limiting conditions.

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“…Plant breeders at Texas AgriLife Research stations in College Station and Lubbock, TX developed 55 of the inbred lines from diverse germplasm sources. Six of the Texas AgriLife lines have been released [26][27][28][29][30] with the rest being "elite" inbreds from other programs, only some of which have been formally released [30,31]. Overall, germplasm consisted of a wide array of grain colors and genetic backgrounds, including yellow, white, red and blue grain types derived from tropical, Argentine and temperate origins.…”

Section: Germplasmmentioning

confidence: 99%

Measuring Maize Seedling Drought Response in Search of Tolerant Germplasm

Meeks¹,

Murray²,

Hague³

et al. 2013

Agronomy

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Abstract:To identify and develop drought tolerant maize (Zea mays L.), high-throughput and cost-effective screening methods are needed. In dicot crops, measuring survival and recovery of seedlings has been successful in predicting drought tolerance but has not been reported in C4 grasses such as maize. Seedlings of sixty-two diverse maize inbred lines and their hybrid testcross progeny were evaluated for germination, survival and recovery after a series of drought cycles. Genotypic differences among inbred lines and hybrid testcrosses were best explained approximately 13 and 18 days after planting, respectively. Genotypic effects were significant and explained over 6% of experimental variance. Specifically three inbred lines had significant survival, and 14 hybrids had significant recovery. However, no significant correlation was observed between hybrids and inbreds (R 2 = 0.03), indicating seedling stress response is more useful as a secondary screening parameter in hybrids than in inbred lines per se. Field yield data under full and limited irrigation indicated that seedling drought mechanisms were independent of drought responses at flowering in this study.

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Registration of Tx714 Maize Germplasm Line

Cited by 7 publications

References 3 publications

Genome Wide Association Study for Drought, Aflatoxin Resistance, and Important Agronomic Traits of Maize Hybrids in the Sub-Tropics

Genome Wide Association Study for Drought, Aflatoxin Resistance, and Important Agronomic Traits of Maize Hybrids in the Sub-Tropics

Genetic Variation for Maize Epicuticular Wax Response to Drought Stress at Flowering

Measuring Maize Seedling Drought Response in Search of Tolerant Germplasm

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