Abstract
In this study, a detailed characterization of earthworm low molecular size humic substances (LMS) was performed and these substances were used to study their effect on the nitrate influx in roots, tissue nitrate content, and expression of maize genes putatively involved in nitrate uptake in maize (Zea mays L.). The results show that the humic fraction with low molecular size used in this study is endowed with the characteristic structural network described for most humic substances so far isolated and confirm the presence of IAA in this fraction. The results also show that the LMS fraction of humic substances stimulates the uptake of nitrate by roots and the accumulation of the anion at the leaf level. Moreover, the analysis of the expression of genes encoding two putative maize nitrate transporters (ZmNrt2.1 and ZmNrt1.1) and of two maize H(+)-ATPase isoforms (Mha1 and Mha2) show that these substances may exert direct effects on gene transcription in roots, as shown for the Mha2 gene, and long-distance effects in shoots, as observed for the ZmNrt2.1 gene.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 5
Claim · model-written summary
LMS humic fraction stimulates nitrate uptake by maize roots and nitrate accumulation at the leaf level.
- Treatment
- LMS fraction of humic substancese1
- Outcome
- uptake of nitrate by roots and the accumulation of the anion at the leaf levele1
- Direction
- stimulatese1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in maize (Zea mays L.)”
e1“the LMS fraction of humic substances stimulates the uptake of nitrate by roots and the accumulation of the anion at the leaf level”
Claim · model-written summary
The LMS humic fraction contains IAA.
- Outcome
- presence of IAA in this fractione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in maize (Zea mays L.)”
e2“confirm the presence of IAA in this fraction”
Claim · model-written summary
The LMS humic fraction has the characteristic humic structural network.
- Outcome
- characteristic structural networke3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in maize (Zea mays L.)”
e3“endowed with the characteristic structural network”
Claim · model-written summary
LMS humic substances may exert direct effects on gene transcription in maize roots, as shown for Mha2.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in maize (Zea mays L.)”
e1“the LMS fraction of humic substances stimulates the uptake of nitrate by roots”
e4“may exert direct effects on gene transcription in roots, as shown for the Mha2 gene”
Claim · model-written summary
LMS humic substances may exert long-distance effects in maize shoots, as observed for ZmNrt2.1.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in maize (Zea mays L.)”
e1“the LMS fraction of humic substances stimulates the uptake of nitrate by roots”
e5“long-distance effects in shoots, as observed for the ZmNrt2.1 gene”
The same questions in other papers
other · nutrient: content · Zea mays (maize)Positive and negative results
106 papers in the same direction as this paper · 9 in the opposite direction · 3 reporting no difference from an alternative
- positive
- negative
- negative
115 papers more in this group
See all 119 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.