Abstract
Abstract The aims of this work were to investigate possible reasons for root mortality of maize plants at the reproductive stage and relationships between root mortality and internal sugar and external nitrogen (N) supply. Maize ( Zea mays L.) plants were grown in the field in fertile soil and in a greenhouse in quartz sand with sufficient or deficient N supply. Deficient N supply reduced plant growth and total N uptake by 38% and 52%, respectively. The lengths of the seminal roots and of the early initiated adventitious roots of the first two whorls declined after reaching their maximum values before silking, no matter whether the plants were grown in the field or in quartz sand in the greenhouse. The lengths of the adventitious roots from higher nodes of plants grown in quartz sand, irrespective of N supply, did not decrease at the reproductive stage despite of decreasing sugar concentrations. In contrast, under field conditions, the length of adventitious roots from higher nodes decreased during grain filling. Total activity of all roots of greenhouse‐grown plants as deduced from translocation of N and cytokinins in the xylem exudate reached peak values at the end of the growing period, whereas in field‐grown plants N translocation decreased and cytokinin translocation did not change toward the end of the growing period. The results indicate that the pattern of root growth and mortality of maize plants in the reproductive stage was not affected by external N supply. Differences between glasshouse‐ and field‐grown plants are possibly due to effects of soil biota, which have to be further studied.
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 9
Claim · model-written summary
Nitrogen deficiency reduced maize growth by 38%.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficient N supply reduced plant growth and total N uptake by 38% and 52%, respectively.”
t0“maize plants”
Claim · model-written summary
Nitrogen deficiency reduced total nitrogen uptake by 52%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficient N supply reduced plant growth and total N uptake by 38% and 52%, respectively.”
t0“maize plants”
Claim · model-written summary
Seminal and early adventitious roots shortened after their pre-silking maxima in both settings.
- Organ / stage
- before silkinge0
- Outcome
- lengths of the seminal roots and of the early initiated adventitious rootse0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lengths of the seminal roots and of the early initiated adventitious roots of the first two whorls declined after reaching their maximum values before silking, no matter whether the plants were grown in the field or in quartz sand in the greenhouse.”
t0“maize plants”
Claim · model-written summary
Higher-node adventitious roots did not shorten in quartz sand despite declining sugars.
- Outcome
- lengths of the adventitious roots from higher nodese0
- Direction
- did not decreasee0
- Qualifier
- irrespective of N supplye0
- Setting
- quartz sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lengths of the adventitious roots from higher nodes of plants grown in quartz sand, irrespective of N supply, did not decrease at the reproductive stage despite of decreasing sugar concentrations.”
t0“maize plants”
Claim · model-written summary
Higher-node adventitious roots shortened during grain filling in the field.
- Organ / stage
- grain fillinge0
- Outcome
- length of adventitious roots from higher nodese0
- Direction
- decreasede0
- Setting
- field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under field conditions, the length of adventitious roots from higher nodes decreased during grain filling.”
t0“maize plants”
Claim · model-written summary
Greenhouse root activity peaked at the end of growth.
- Organ / stage
- end of the growing periode0
- Outcome
- Total activity of all rootse0
- Direction
- reached peak valuese0
- Setting
- greenhouse‐growne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total activity of all roots of greenhouse‐grown plants as deduced from translocation of N and cytokinins in the xylem exudate reached peak values at the end of the growing period”
t0“maize plants”
Claim · model-written summary
Field-grown plants showed decreased nitrogen translocation near the end of growth.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in field‐grown plants N translocation decreased and cytokinin translocation did not change toward the end of the growing period.”
t0“maize plants”
Claim · model-written summary
Field-grown plants showed unchanged cytokinin translocation near the end of growth.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in field‐grown plants N translocation decreased and cytokinin translocation did not change toward the end of the growing period.”
t0“maize plants”
Claim · model-written summary
Nitrogen supply did not affect the pattern of root growth and mortality.
- Treatment
- external N supplye0
- Outcome
- pattern of root growth and mortalitye0
- Direction
- was not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pattern of root growth and mortality of maize plants in the reproductive stage was not affected by external N supply.”
The same questions in other papers
nitrogen · nutrient: content · Zea mays (maize)Positive and negative results
402 papers in the same direction as this paper · 83 in the opposite direction · 3 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- no effect
- negative
485 papers more in this group
See all 489 papers →nitrogen · growth · Zea mays (maize)Positive and negative results
618 papers in the same direction as this paper · 115 in the opposite direction · 14 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- positive
744 papers more in this group
See all 748 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.