Abstract
L.) is of high value in providing cheap and high-nutritive forages. Due to a lack of tillage during the production period, the soil in which alfalfa grows prunes to become compacted through highly mechanized agriculture. Compaction deteriorates the soil's structure and fertility, leading to compromised alfalfa development and productivity. However, the way alfalfa responses to different levels of soil compaction and the underlying molecular mechanism are still unclear. In this study, we systematically evaluated the effects of gradient compacted soil on the growth of different cultivars of alfalfa, especially the root system architecture, phytohormones and internal gene expression profile alterations. The results showed that alfalfa growth was facilitated by moderate soil compaction, but drastically inhibited when compaction was intensified. The inhibition effect was universal across different cultivars, but with different severity. Transcriptomic and physiological studies revealed that the expression of a set of genes regulating the biosynthesis of lignin and flavonoids was significantly repressed in compaction treated alfalfa roots, and this might have resulted in a modified secondary cell wall and xylem vessel formation. Phytohormones, like ABA, are supposed to play pivotal roles in the regulation of the overall responses. These findings provide directions for the improvement of field soil management in alfalfa production and the molecular breeding of alfalfa germplasm with better soil compaction resilience.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Moderate soil compaction facilitated alfalfa growth.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- moderate soil compactione0
- Outcome
- alfalfa growthe0
- Direction
- facilitatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa growth was facilitated by moderate soil compaction”
Claim · model-written summary
Intensified compaction drastically inhibited alfalfa growth.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- compaction was intensifiede0
- Outcome
- alfalfa growthe0
- Direction
- drastically inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa growth was facilitated by moderate soil compaction, but drastically inhibited when compaction was intensified”
Claim · model-written summary
Compaction inhibition was universal across cultivars but varied in severity.
Not reportedTaxon
Verbatim
e0“The inhibition effect was universal across different cultivars, but with different severity.”
Claim · model-written summary
Compaction significantly repressed root expression of genes regulating lignin and flavonoid biosynthesis.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- rootse0
- Treatment
- compaction treatede0
- Outcome
- expression of a set of genes regulating the biosynthesis of lignin and flavonoidse0
- Direction
- repressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expression of a set of genes regulating the biosynthesis of lignin and flavonoids was significantly repressed in compaction treated alfalfa roots”
Claim · model-written summary
The altered gene expression might modify secondary cell wall and xylem vessel formation.
Not reportedTaxon
Verbatim
e0“this might have resulted in a modified secondary cell wall and xylem vessel formation”
Claim · model-written summary
ABA is proposed to play a pivotal role in responses to compaction.
Not reportedTaxon
Verbatim
e0“Phytohormones, like ABA, are supposed to play pivotal roles in the regulation of the overall responses.”
The same questions in other papers
tillage · growth · Medicago sativa (alfalfa)Positive and negative results
6 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- no effect
12 papers more in this group
See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.