Phosphate absorption by excised ordinary and proteoid roots of Protea compacta R. Br.

Smith, A. J. E.; Jooste, J.H.

doi:10.1016/s0254-6299(16)31490-9

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…The uptake rates of P are 2-13 times higher in cluster roots compared to ordinary roots on a dry weight basis (Lamont, 1982 and references therein). Smith and Jooste (1986) found no such increase, but Dinkelaker et al (1995) explain that such contradictory results are to be expected in view of the restricted longevity of these structures. Vorster and Jooste (1986) have shown that cluster roots have a more effective absorption mechanism for P than have normal roots based on Lineweaver-Burke kinetic analysis at both low (0n02-0n1 m KH # PO % ) and high (1n0-50 m KH # PO % ) concentration ranges.…”

Section: Introductionmentioning

confidence: 99%

Structural Aspects of Cluster Root Development and their Possible Significance for Nutrient Acquisition inGrevillea robusta(Proteaceae)

et al. 1996

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Light microscopy (LM), scanning (SEM) and transmission electron microscopy (TEM) were used to study structure and function of cluster roots in Gre illea robusta. These roots were developed during growth of G. robusta seedlings in modified Hoagland's solution lacking phosphate. Cluster rootlets formed root hairs, basipetally, only after completing their determinate development. The rootlet hairs branched in two ways and some had apical swelling. Rootlets with hairs produced two different forms of exudate, one fibrous and the other globular in nature. The fibrous material appeared to be synthesised in the cortical cells. It is released by exocytosis from the epidermis. Rootlet hairs produced only fibrous exudate. They attached firmly to pieces of vermiculite. The significance of cluster roots is discussed within the context of patchy soil resources.# 1996 Annals of Botany Company

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Section: Introductionmentioning

confidence: 99%

Structural Aspects of Cluster Root Development and their Possible Significance for Nutrient Acquisition inGrevillea robusta(Proteaceae)

et al. 1996

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“…As with other members of the Proteaceae, northern silky oak has specialized proteoid roots that form in dense clusters near the soil surface and are believed to play a role in selective nutrient uptake (Jeffrey, 1967;Vorster and Jooste, 1986). Proteoid roots may also be more metabolically active than ordinary roots (Smith and Jooste, 1986). To account for the high incidence of plant injury after application of oxidiazon in combination with simazine, Lamont and Spohr (1988) proposed that proteoid roots in Grevillea may be more efficient in absorbing simazine than oxadiazon.…”

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confidence: 99%

Herbicides for Container-grown Rain Forest Species

Sharman¹

1993

HortSci

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Four granular formulations of preemergence herbicides-oxadiazon, oxadiazon in combination with simazine, dichlobenil, and oxyfluorfen + oryzalin-were evaluated for weed control and phytotoxic effects on 10 species of container-grown Australian rain forest plants. Herbicides were applied at half and at one and two times the manufacturer's recommended rate. Oxyfluorfen + oryzalin, oxadiazon, and oxadiazon + simazine controlled all weed species at half the recommended rates (1.0 + 0.5, 2.0, and 2.0 + 0.5 kg·ha-1, respectively) with no phytotoxic effects after 10 weeks to nine of the 10 rain forest species tested: broad-leafed lilly-pilly [Acmena hemilampra (F. Muell. ex Bailey) Merr. and Perry], red ash [Alphitonia excelsa (Cunn. ex Fenzl) Reisseck ex Benth.], rusty bean [Dysoxylum rufum (A. Rich.) Benth.], macaranga [Macaranga tanarius (L.) Muell. Arg.], fibrous satinash [Syzygium fibrosum (Bailey) T. Hartley and Perry], Queensland golden myrtle [Metrosideros queenslandica L.S. Smith], cluster fig [Ficus racemosa L.], corduroy tamarind [Arytera lautereriana (Bailey) Radlk.], and celerywood [Polyscias elegans (F. Muell and C. Moore) Harms]. Dichlobenil depressed plant growth of red ash and failed to control bittercress (Cardamine hirsuta L.) and green amaranth (Amaranthus viridus L.), even at twice the recommended rate (4.0 kg·ha-1). All herbicides applied at half the recommended rates produced minor to moderate plant injury within 5 weeks of the first application to corduroy tamarind and northern silky oak [Cardwellia sublimis F. Muell.]. A second application 10 weeks after the first caused no significant plant injury to corduroy tamarind but resulted in severe plant injury to northern silky oak. This finding validates the previously reported sensitivity of Proteaceous spp. to preemergence herbicides. Chemical names used: (2-tert-butyl-4-(2,4-dichloro-5-isopropoxyphenyl)-Δ2-1,3,4 oxadiazoline-5-one) (oxadiazon); (2-chloro-4,6-bisethylamino-1,3,5-triazine) (simazine); 2,6-dichlorobenzonitrile (dichlobenil); 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene (oxyfluorfen); and 3,5-dinitro-N4,N4 -dipropylsulfanilamide (oryzalin).

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“…Inclusion of sucrose in experimental solutions stimulated the translocation of P from the proteoid roots, suggesting an energydependent mechanism for translocation from proteoid roots to the aerial parts. Proteoid roots were metabolically more active in P absorption at 35°C than at lower temperatures, while ordinary roots increased their rate of P absorption over the range of 15 to 35°C (Smith and Jooste 1986). Proteoid roots also displayed a higher oxygen uptake than did ordinary roots.…”

Section: Nutrition and Fertilizationmentioning

confidence: 91%

Banksia:New Proteaceous Cut Flower Crop

Sedgley¹

1998

Horticultural Reviews

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More than 1400 species have been recognized in the ancient Proteaceae family (Rebelo 1995). Their occurrence is mostly distributed between Australia with about 800 species and Africa with about 400 species with the remainder found in South America, the islands east of New Guinea, and a few species in southeast Asia, New Zealand, and Madagascar. They are broadly referred to as proteas, although we identify specific genera by their Latin names. The subfamily Proteoideae, largely found in Africa, has contributed the genera Protea, Leucadendron, and Leucospermum to floricultural trade, while the Australian Grevilleoideae has contributed Banksia and Grevillea that have found similar use in floriculture and landscaping. Other genera are still emerging in importance (Criley, 2001

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Phosphate absorption by excised ordinary and proteoid roots of Protea compacta R. Br.

Cited by 7 publications

References 3 publications

Structural Aspects of Cluster Root Development and their Possible Significance for Nutrient Acquisition inGrevillea robusta(Proteaceae)

Structural Aspects of Cluster Root Development and their Possible Significance for Nutrient Acquisition inGrevillea robusta(Proteaceae)

Herbicides for Container-grown Rain Forest Species

Banksia:New Proteaceous Cut Flower Crop

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