Effects of S-metolachlor on wheat (Triticum aestivum L.) seedling root exudates and the rhizosphere microbiome

The use of microbial preparations contributed to a change in the taxonomic structure of winter wheat rhizosphere microbiome was established. A more significant effect of microbial preparations was noted under no-till technology on the structure of the microbiome than with the traditional farming system.

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Identification of QTL regions for seedling root traits and their effect on nitrogen use efficiency in wheat (Triticum aestivum L.)

Theoretical and Applied Genetics ◽

10.1007/s00122-018-3183-6 ◽

2018 ◽

Vol 131 (12) ◽

pp. 2677-2698 ◽

Cited By ~ 6

Author(s):

Xiaoli Fan ◽

Wei Zhang ◽

Na Zhang ◽

Mei Chen ◽

Shusong Zheng ◽

...

Keyword(s):

Triticum Aestivum ◽

Nitrogen Use Efficiency ◽

Root Traits ◽

Triticum Aestivum L ◽

Nitrogen Use ◽

Seedling Root ◽

Use Efficiency

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Phenotyping and Identification of Reduced Height (Rht) Alleles (Rht-B1b and Rht-D1b) in a Nepali Spring Wheat (Triticum aestivum L.) Diversity Panel to Enable Seedling Vigor Selection

Agronomy ◽

10.3390/agronomy11122412 ◽

2021 ◽

Vol 11 (12) ◽

pp. 2412

Author(s):

Kamal Khadka ◽

Mina Kaviani ◽

Manish N. Raizada ◽

Alireza Navabi

Keyword(s):

Triticum Aestivum ◽

Drought Stress ◽

Spring Wheat ◽

Allelic Variation ◽

Triticum Aestivum L ◽

Coleoptile Length ◽

Early Season ◽

Positive Effects ◽

Seedling Root ◽

Reduced Height

Nepal is facing more intense early-season drought stress associated with climate change. The introgression of reduced height (Rht) alleles to enable stem dwarfism in bread wheat (Triticum aestivum L.) inadvertently reduced coleoptile length and growth plasticity in seedlings, making improved varieties less suitable for deep seeding; these alleles may have also reduced seedling root length. Therefore, with the long-term objective of breeding wheat for early-season drought stress, a Nepali spring wheat panel was evaluated to assess allelic variation at the most common dwarfing-associated loci (Rht-B1, Rht-D1) and their impact on coleoptile/seedling root traits, and to identify accessions with longer and/or more GA-responsive coleoptiles as parents for future breeding. Here, Kompetitive Allele Specific PCR (KASP) was used to genotype accessions. The panel was phenotyped using the cigar-roll method in the presence/absence of GA3. Plant height was measured under field conditions. The results showed that Nepali landraces had a significantly higher frequency of the non-dwarfing allele Rht-B1a. The dwarfing alleles Rht-B1b and Rht-D1b had negative effects on coleoptile length but positive effects on the length of the longest seedling root. However, 40 potential semi-dwarf accessions (possessing Rht-B1b and/or Rht-D1b alleles) with long and/or more plastic coleoptiles suited for deep sowing were identified. This included 12 accessions that exhibited significant changes in coleoptile length in response to GA3 treatment.

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