Boron Mobility in Two Coniferous Species

Lehto, Tarja; Kallio, E.; Aphalo, Pedro J.

doi:10.1006/anbo.2000.1215

Cited by 26 publications

(26 citation statements)

References 13 publications

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“…It seems, therefore, that the roots responded to different rates of B addition in the nutrient solution and to the needle B concentrations at a stage when the concentrations in the roots did not yet differ between the B levels and the needle B concentrations were optimal at all three B levels. In a recent study by Lehto et al (2000) it was shown that in Norway spruce B can be translocated in the phloem from shoots to roots and, therefore, some B in roots may have been translocated from shoots in the present study. Redistribution of B is likely to diminish the importance of the B concentration of roots and the external B supply on root growth at any particular moment, as B can be moved from the shoot for root growth.…”

Section: Discussionmentioning

confidence: 65%

Growth dynamics and mycorrhizas of Norway spruce ( Picea abies) seedlings in relation to boron supply

Möttönen

Lehto

Aphalo

2001

Trees

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The effects of three boron levels on the growth dynamics and ectomycorrhizas of seedlings of Norway spruce [Picea abies (L.) Karst.] were studied in a growth room experiment. The seedlings were grown in forest humus mixed with quartz sand for 16 weeks. The B treatment was applied in the nutrient solution. Stem height, dry weight, number of root tips, mycorrhizas as well as B and N concentrations in the seedlings were monitored in sequential harvests. By the last harvest, in week 16, needle B concentrations were 6.6 mg kg -1 at the lowest B level and 17.5 mg kg -1 and 26.5 mg kg -1 at the two higher levels. Boron slightly increased the stem height and the total dry weight, but did not affect N content of the seedlings. Low internal B reduced the number of root tips and mycorrhizas as well as mycorrhizal percentage and root dry weight, which indicates the importance of B for root growth in Norway spruce seedlings. The seedlings grown with adequate internal B had more root tips than those receiving the two lower B treatments as early as week 9, when needle B concentrations at the lowest B supply were 16.0-17.3 mg kg -1 , which has previously been considered a sufficient B level. Therefore, the critical needle B concentrations should perhaps be re-examined.

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Section: Discussionmentioning

confidence: 65%

Growth dynamics and mycorrhizas of Norway spruce ( Picea abies) seedlings in relation to boron supply

Möttönen

Lehto

Aphalo

2001

Trees

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“…In addition, as the B concentrations were low in the −B seedlings, they were not able to retranslocate B from other plant parts either, although retranslocation of B has been observed in the Norway spruce (Lehto et al 2000(Lehto et al , 2004. The visible damage to the apical growth of the −B seedlings observed here after two drought periods may have been caused by this inadequate and/or non-continuous B supply to the continuously active meristematic areas, as also observed in the developing buds of mature Norway spruce trees growing in soil poor in B (S. Sutinen, personal communication).…”

Section: Discussionmentioning

confidence: 84%

Recovery of Norway spruce (Picea abies) seedlings from repeated drought as affected by boron nutrition

Möttönen

Lehto

Rita

et al. 2004

Trees

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The effects of two boron (B) levels on growth, shoot water potential, gas exchange and nutrient accumulation in Norway spruce [Picea abies (L.) Karst.] seedlings were studied in a growth room experiment lasting 22 weeks which included well-watered control seedlings and seedlings exposed to one (8 days) or two (6+8 days) periods of drought and a rewatering period (8 days) at the end of the experiment. The effects of B and drought were monitored during drought and recovery. Needle B concentrations were 6 mg kg −1 (−B treatment) and 34 mg kg −1 (+B treatment) at the end of the experiment. The −B seedlings showed visible symptoms of damage in the upper shoot after repeated drought and had reduced height growth, root dry mass, allocation of biomass to roots and formation of root tips and mycorrhizas and reduced needle P, Ca, and Mg concentrations and contents. In contrast, 15 N uptake, shoot water potential and gas exchange were not markedly affected by B. It can be concluded that the visible symptoms of damage at low B were probably related to reduced B transport due to repeated drought. In contrast, the effects of low B on growth, particularly of the roots, and on nutrient uptake can be regarded as early effects which occur before any influence on shoot water potential or gas exchange. The positive effects of B on root biomass and nutrient accumulation are of particular importance regarding the establishment of young seedlings in the field.

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“…Later, tracer experiments became widespread with both root (Marentes et al 1997;Bellaloui and Brown 1998;Matoh and Ochiai 2005) and foliar application (Perica et al 2001;Lehto et al 2000Lehto et al , 2004aLehto et al , 2004b, providing evidence for the movement of B within plants (Brown et al 1992). In the current study, tracer experiments with the isotope 10 B confirmed B retranslocation in peanut.…”

Section: Discussionmentioning

confidence: 97%

Boron mobility in peanut (Arachis hypogaea L.)

2009

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In most plant families, boron (B) is phloem immobile. For plants such as peanut which bury their fruit, the mechanism for B delivery and the B source for fruit and seed growth remains enigmatic. Therefore, this study aimed to establish evidence of B retranslocation in peanut and to identify its importance in plant development. In a sand culture experiment, the increase in B contents in new organs after B withdrawal and the corresponding decline in B contents in older organs was evidence of B redistribution. In a foliar 10 B experiment, the 10 B abundance of treated-leaves decreased and 10 B was detected in leaves and flowers formed after the application of foliar B. Application of 10 B to the roots for a period also provided evidence for the retranslocation of 10 B accumulated during the first growth period. The 10 B abundance in older plant parts declined and 10 B appeared in new organs (flowers, pegs, leaves) that had developed after the 10 B supply had been replaced by 11 B. In the fourth experiment, foliar application of B reduced hollow heart, a symptom of B deficiency in seeds, in cv. TAG 24 from 39 to 8% and in Tainan 9 from 63 to 18%. These experiments all provide evidence for B retranslocation in peanut, but further work on the relative importance of the xylem and phloem pathways for B loading into the fruit is needed.

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Boron Mobility in Two Coniferous Species

Cited by 26 publications

References 13 publications

Growth dynamics and mycorrhizas of Norway spruce ( Picea abies) seedlings in relation to boron supply

Growth dynamics and mycorrhizas of Norway spruce ( Picea abies) seedlings in relation to boron supply

Recovery of Norway spruce (Picea abies) seedlings from repeated drought as affected by boron nutrition

Boron mobility in peanut (Arachis hypogaea L.)

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