Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

Shoot growth on lucerne plants cut at different heights

Australian Journal of Agricultural Research ◽

10.1071/ar9700583 ◽

1970 ◽

Vol 21 (4) ◽

pp. 583 ◽

Cited By ~ 12

Author(s):

GJ Leach

Keyword(s):

Medicago Sativa ◽

Dry Matter ◽

Shoot Growth ◽

Total Yield ◽

Extension Growth ◽

Medicago Sativa L ◽

Cutting Height ◽

Two Stages

Lucerne (Medicago sativa L.) plants grown to two stages of maturity were cut at 2, 5, or 10 cm above the crown. In addition, the leaf on the stubble and on basal shoots was either removed or retained. The change in the number and size of the regrowth shoots growing from different heights above the crown, and the total yield of dry matter, were observed for 4 weeks after cutting. Nearly all the regrowth shoots arose from very near to the crown, either on the crown itself or from within the first 2 cm above it, so that cutting at higher levels increased shoot numbers only slightly. Also most of the shoots arising from near the crown resumed extension growth earlier, and therefore grew larger, than the shoots arising from higher positions. In general the growth of shoots from one stubble segment was not influenced by whether segments were still present above. Increasing the cutting height above 2 cm consequently produced little effect on the yield of dry matter 2 and 4 weeks after cutting. Retaining stubble leaf and basal shoot leaf increased the shoot yield 2 and 4 weeks later, because the basal shoots resuming growth first grew larger than those on plants from which leaves were removed. The effect of retaining leaves was independent of the stage of maturity when the plants were cut and of the cutting height.

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Release of tartrate as a major carboxylate by alfalfa (Medicago sativa L.) under phosphorus deficiency and the effect of soil nitrogen supply

Plant and Soil ◽

10.1007/s11104-020-04481-9 ◽

2020 ◽

Vol 449 (1-2) ◽

pp. 169-178

Author(s):

Honghua He ◽

Miaomiao Wu ◽

Lei Guo ◽

Chenbin Fan ◽

Zekun Zhang ◽

...

Keyword(s):

Medicago Sativa ◽

Soil Nitrogen ◽

Phosphorus Deficiency ◽

Nitrogen Supply ◽

Medicago Sativa L ◽

Soil Nitrogen Supply

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The Role of Different Daily Irradiations on Shoot Growth and Root/Shoot Ratio in Lucerne (Medicago sativa L.)

Annals of Botany ◽

10.1093/oxfordjournals.aob.a088260 ◽

1991 ◽

Vol 68 (4) ◽

pp. 329-335 ◽

Cited By ~ 4

Author(s):

S. PHILIPPOT ◽

J. M. ALLIRAND ◽

M. CHARTIER ◽

G. GOSSE

Keyword(s):

Medicago Sativa ◽

Shoot Growth ◽

Shoot Ratio ◽

Root Shoot Ratio ◽

Medicago Sativa L

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Root and Shoot Growth Response of Three Container-Grown Kalmia latifolia L. Cultivars at Two Locations to Growing Medium and Nitrogen Form

Journal of Environmental Horticulture ◽

10.24266/0738-2898-8.1.10 ◽

1990 ◽

Vol 8 (1) ◽

pp. 10-13

Author(s):

Rita L. Hummel ◽

Charles R. Johnson ◽

Orville M. Lindstrom

Keyword(s):

Root Growth ◽

Growth Response ◽

Shoot Growth ◽

Nitrogen Form ◽

Growing Media ◽

Kalmia Latifolia ◽

Growing Medium ◽

Root And Shoot Growth ◽

Shoot And Root Growth

Abstract Rooted liners of Kalmia latifolia L. ‘Elf’, ‘Freckles’ and ‘Goodrich’ were shipped to Griffin, Georgia, and Puyallup, Washington and were potted into 3.8 liter (# 1) containers. Factorial combinations of growing media (1 bark: 1 peat, 4 bark: 1 peat), NO3/NH4 ratios (100% NO3/0% NH4, 60% NO3/40% NH4, 20% NO3/80% NH4), and rates of N (40, 80, and 120 mg N/pot; 0.0014, 0.0028, and 0.0042 oz N/pot, resp.) were applied at both locations. Results indicated that a combination of the nitrate/ammonium forms of nitrogen (60/40 NO3/NH4) and the 80 mg/pot N rate produced the best overall shoot and root growth on all 3 cultivars at both locations. Root and shoot growth was not affected by growing media at either location. With the exception of lower pH readings for the Georgia media, results for the two locations were remarkably consistent.

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Contribution of Current Photosynthates to Root Respiration of Non-Nodulated Medicago sativa: Effects of Light and Nitrogen Supply

Plant Biology ◽

10.1055/s-2005-872881 ◽

2005 ◽

Vol 7 (6) ◽

pp. 601-610 ◽

Cited By ~ 8

Author(s):

M. Lötscher ◽

S. Gayler

Keyword(s):

Medicago Sativa ◽

Root Respiration ◽

Nitrogen Supply

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Autumn dormancy regulates the expression of cas18, vsp and corF genes during cold acclimation of lucerne (Medicago sativa L.)

Crop and Pasture Science ◽

10.1071/cp15289 ◽

2016 ◽

Vol 67 (6) ◽

pp. 666 ◽

Cited By ~ 5

Author(s):

Zhi-ying Liu ◽

Guo-feng Yang ◽

Xi-liang Li ◽

Ya-fei Yan ◽

Juan Sun ◽

...

Keyword(s):

Medicago Sativa ◽

Lateral Root ◽

Shoot Growth ◽

First Year ◽

Forage Legume ◽

Vegetative Storage Protein ◽

Gene Transcripts ◽

Ecological Mechanisms ◽

Medicago Sativa L

As a global forage legume, lucerne (alfalfa, Medicago sativa L.) is valuable for studying the evolutionary and ecological mechanisms of plant adaptation to freezing, owing to the characteristic of contrasting winter hardiness induced by autumn dormancy. Autumn-dormant lucerne plants often exhibit greater cold tolerance than non-dormant plants under natural field conditions. The study examined the autumn shoot growth of four diverse lucerne cultivars, and the influence of two sampling dates in late autumn, three sampling positions and four autumn-dormancy categories on cas18, vsp and corF gene transcripts during the first year of lucerne establishment. Results showed that in field-grown lucerne, non-dormant and highly non-dormant cultivars had greater shoot growth than a dormant cultivar in autumn. The level of transcripts of cas18 (which encodes a dehydrin-like protein) was highest in dormant cultivars and lowest in semi-dormant cultivars in both November and December; in particular, the cas18 transcripts in the crown remained highest in both November and December. The level of transcripts of vsp (which encodes vegetative storage protein) in all dormant cultivar tissues was highest in both November and December. In semi-dormant cultivars, the expression of vsp in the taproot increased compared with the lateral root and crown in November. The corF transcript in the dormant cultivar was markedly higher than in the semi-dormant cultivar and almost zero in the non-dormant and highly non-dormant cultivars. These results indicate that the significant impact of autumn dormancy and plant position on gene expression of cas18, vsp and corF occurring during autumn hardening, and continuing low temperatures, are likely to have significant consequences on lucerne productivity and its long-term persistence.

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Increasing nitrogen supply to phosphorus-deficient Medicago sativa decreases shoot growth and enhances root exudation of tartrate to discharge surplus carbon dependent on nitrogen form

10.21203/rs.3.rs-636655/v1 ◽

2021 ◽

Author(s):

Honghua He ◽

Zekun Zhang ◽

Qi Peng ◽

Chao Chang ◽

Rui Su ◽

...

Keyword(s):

Plant Growth ◽

Shoot Growth ◽

Root Exudation ◽

N:P Ratio ◽

Nitrogen Addition ◽

Shoot Biomass ◽

Plant Nitrogen ◽

N Form ◽

P Addition ◽

N Status

Abstract Aims Carboxylate release by roots has been considered a strategy for mobilization and acquisition of phosphorus (P). However, recently, it was argued that carboxylate release may be a way to discharge surplus carbon produced under conditions that limit plant growth. Plant P status may not be the main factor driving carboxylate release by roots. Instead, plant nitrogen (N) status and/or N:P ratio of the soil or plant may play a more important role in enhancing carboxylate release. Methods A greenhouse pot experiment was performed to grow alfalfa in a P-deficient soil, supplied with two rates of P (0 and 20 mg kg− 1) in combination with four forms of nitrogen (N) at five rates (0, 25, 50, 75, and 100 mg kg− 1), to explore the effects of P rate, N form, N rate, and their interactions on plant growth, P and N status, and carboxylate release, and to determine the factors driving carboxylate release. Results Nitrogen addition weakened the positive effect of P addition on plant growth, and increased plant N ([N]) and P concentrations ([P]); P addition increased plant [P], but weakened the effect of N addition on plant [N]. The amount of tartrate increased dramatically with increasing N rate, which decreased shoot growth, depending on N form. At high P supply, tartrate exudation correlated negatively with shoot biomass. Conclusions Nitrogen addition to P-deficient alfalfa decreased shoot growth and enhanced the release of tartrate, likely to discharge surplus carbon; and the effects varied with N form.

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