Abstract
Abstract Background and aims The escalating issue of soil saline-alkalization poses a growing global challenge. Leymus chinensis is a perennial grass species commonly used in the establishment and renewal of artificial grasslands that is relatively tolerant of saline, alkaline, and drought conditions. Nonetheless, reduced seed setting rates limit its propagation, especially on alkali-degraded grassland. Inter-annual variations have an important effect on seed yield and germination under abiotic stress, and we therefore examined the effect of planting year on seed yield components of L. chinensis . Methods We grew transplanted L. chinensis seedlings in pots for two (Y 2 ), three (Y 3 ), or four (Y 4 ) years and collected spikes for measurement of seed yield components, including spike length, seed setting rate, grain number per spike, and thousand seed weight. We then collected seeds produced by plants from different planting years and subjected them to alkaline stress (25 mM Na 2 CO 3 ) for measurement of germination percentage and seedling growth. Results The seed setting rate of L. chinensis decreased with an increasing number of years in pot cultivation, but seed weight increased. Y 2 plants had a higher seed setting rate and more grains per spike, whereas Y 4 plants had a higher thousand seed weight. The effects of alkaline stress (25 mM Na 2 CO 3 ) on seed germination were less pronounced for the heavier seeds produced by Y 4 plants. Na 2 CO 3 caused a 9.2% reduction in shoot length for seedlings derived from Y 4 seeds but a 22.3% increase in shoot length for seedlings derived from Y 3 seeds. Conclusions Our findings demonstrate significant differences in seed yield components among three planting years of L. chinensis under pot cultivation in a finite space. Inter-annual variation in seed set may provide advantages to plants. Increased alkalinity tolerance of seed germination was observed for seeds produced in successive planting years.
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Claims 10
Claim · model-written summary
Seed setting rate declined with more years in pots.
- Taxon
- L. chinensisLeymus chinensise0
- Outcome
- seed setting ratee0
- Direction
- decreasede0
- Setting
- pot cultivatione0
Verbatim
e0“The seed setting rate of L. chinensis decreased with an increasing number of years in pot cultivation”
Claim · model-written summary
Seed weight rose with more years in pots.
- Taxon
- Leymus chinensisLeymus chinensist0
- Outcome
- seed weighte0
- Direction
- increasede0
- Setting
- pot cultivatione1
Verbatim
e0“but seed weight increased”
t0“Leymus chinensis”
e1“The seed setting rate of L. chinensis decreased with an increasing number of years in pot cultivation”
Claim · model-written summary
Y 2 plants had higher seed setting rate.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 2e0
- Outcome
- seed setting ratee0
- Direction
- highere0
Verbatim
e0“Y 2 plants had a higher seed setting rate and more grains per spike”
t0“Leymus chinensis”
Claim · model-written summary
Y 2 plants had more grains per spike.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 2e0
- Outcome
- grains per spikee0
- Direction
- moree0
Verbatim
e0“Y 2 plants had a higher seed setting rate and more grains per spike”
t0“Leymus chinensis”
Claim · model-written summary
Y 4 plants had higher thousand seed weight.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 4e0
- Outcome
- thousand seed weighte0
- Direction
- highere0
Verbatim
e0“Y 4 plants had a higher thousand seed weight”
t0“Leymus chinensis”
Claim · model-written summary
Alkaline stress affected germination less in heavier Y 4 seeds.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 4e0
- Treatment
- alkaline stress (25 mM Na 2 CO 3 )e0
- Outcome
- seed germinatione0
- Direction
- less pronouncede0
Not reportedComparator
Verbatim
e0“The effects of alkaline stress (25 mM Na 2 CO 3 ) on seed germination were less pronounced for the heavier seeds produced by Y 4 plants”
t0“Leymus chinensis”
Claim · model-written summary
Na2CO3 reduced Y 4 seedling shoot length by 9.2%.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 4e0
- Treatment
- Na 2 CO 3e0
- Outcome
- shoot lengthe0
- Direction
- reductione0
- Value
- 9.2%e0
Not reportedComparator
Verbatim
e0“Na 2 CO 3 caused a 9.2% reduction in shoot length for seedlings derived from Y 4 seeds”
t0“Leymus chinensis”
Claim · model-written summary
Na2CO3 increased Y 3 seedling shoot length by 22.3%.
- Taxon
- Leymus chinensisLeymus chinensist0
- Material
- Y 3e0
- Treatment
- Na 2 CO 3e1
- Outcome
- shoot lengthe0
- Direction
- increasee0
- Value
- 22.3%e0
Not reportedComparator
Verbatim
e0“a 22.3% increase in shoot length for seedlings derived from Y 3 seeds”
t0“Leymus chinensis”
e1“Na 2 CO 3 caused a 9.2% reduction in shoot length for seedlings derived from Y 4 seeds”
Claim · model-written summary
The authors report significant differences in seed yield components across three planting years.
- Taxon
- L. chinensisLeymus chinensise0
- Outcome
- differences in seed yield componentse0
- Qualifier
- among three planting yearse0
- Setting
- pot cultivation in a finite spacee0
Verbatim
e0“significant differences in seed yield components among three planting years of L. chinensis under pot cultivation in a finite space”
Claim · model-written summary
Seeds produced in successive planting years showed increased alkaline germination tolerance.
- Taxon
- Leymus chinensisLeymus chinensist0
- Outcome
- alkalinity tolerance of seed germinatione0
- Direction
- Increasede0
- Setting
- successive planting yearse0
Verbatim
e0“Increased alkalinity tolerance of seed germination was observed for seeds produced in successive planting years”
t0“Leymus chinensis”
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See all 9 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.