The Effect of Fluctuations of Soil Moisture on Root Development during the Establishment Phase of Sweetpotato

Pardales, Jr. Jose R.; Bañoc, Dionisio M.; Yamauchi, Akira; Iijima, Morio; Esquibel, C.B.

doi:10.1626/pps.3.134

Cited by 13 publications

(11 citation statements)

References 4 publications

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“…The reduction of the nodal root length was moderate in Gadambalia compared with that in Tabat. The inhibition of nodal roots elongation under drought stress has also been observed in sorghum (Pardales and Kono, 1990), sweet potato (Pardales et al, 2000) and rice (Bañoc et al, 2000b). The greater decrease of nodal root length in Tabat would be partly due to the reduction of the number of nodal roots (Table 4).…”

Section: Discussionmentioning

confidence: 73%

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Tsuji

Inanaga

Araki

et al. 2005

Plant Production Science

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Abbreviations : BI, branching index; RLD, root length density; SDW, shoot dry weight; SRL, specifi c root length; TRL, total root length; VWC, volumetric water content; θ, growth angle of nodal roots; θ m , mean growth angle of nodal roots; Ψ L , leaf water potential. Agriculture, Yamaguchi University, 1677-1, Yoshida, Yamaguchi,753-8515, Japan; 3 Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Nishitokyo, Tokyo, Japan) Abstract : The difference in rooting pattern between two grain sorghum cultivars differing in drought tolerance was investigated under drought stress. The cultivars, Gadambalia (drought-tolerant) and Tabat (droughtsusceptible), were grown in bottomless wooden or acrylic root boxes to examine root parameters. Gadambalia consistently exhibited higher dry matter production and leaf water potential than Tabat under drought stress in both root boxes. In the experiment with wooden root boxes, under a drought condition, Gadambalia extracted more water from deep soil layers (1.1-1.5 m), which was estimated from the reduction in soil water content, than Tabat. This was because Gadambalia had a signifi cantly higher root length density in these soil layers. The high root length density was due to enhanced lateral root development in Gadambalia. In the other experiment with acrylic root boxes, though total root length in the upper soil layer (0-0.5 m) was declined by limited irrigation in both cultivars, the reduction in Gadambalia was moderate compared with that in Tabat owing to the maintenance of fi ne root growth. Unlike Tabat, Gadambalia had an ability to produce the nodal roots from higher internodes even under drought, which resulted in the high nodal root length of Gadambalia. The growth angle of nodal roots was signifi cantly correlated with root diameter, and the nodal roots from the higher internodes had large diameters and penetrated into the soil more vertically. These results indicate that the responses of roots (i.e. branching and/or growth of lateral root, and nodal root emergence from higher internodes) to soil dryness could be associated with the drought tolerance of Gadambalia. Development and Distribution of Root System in Two Grain

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Section: Discussionmentioning

confidence: 73%

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Tsuji

Inanaga

Araki

et al. 2005

Plant Production Science

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“…Fibrous roots remaining without secondary growth constitute the water (and nutrient)-absorbing system of the plant and sometimes are referred to as "feeder roots" (Hernandez and Hernandez, 1967). High root zone temperature (40°C) and soil moisture critically influence the development of fibrous roots during initial period of establishment (Pardales et al 1999(Pardales et al , 2000. Some of the adventitious roots that remain pentarch or hexarch, during second week after planting, develop into 2-5 mm thick nonstorage fibrous roots.…”

Section: Root Systemmentioning

confidence: 99%

“…Storage roots of yellow-orange cultivars contain high amounts of carotenoids, up to 45-100 μg g 1 (Badillo-Feliciano et al 1976;Huett 1976;Junek and Sistrunk 1978;Love et al 1978;Collins and Pope 1979;Ikehashi 1985;Kukimura et al 1988;Bhattacharya et al 1990;Tanahata et al 1993;CTCRI 2006). Growth and/or the yield of the storage roots have been shown to be affected by environmental factors, including soil moisture, temperature, humidity, light, photoperiod, and carbon dioxide (Loretan et al 1994;Hill et al 1996;Mortley et al 1996;Eguchi et al 1998;Pardales et al 1999Pardales et al , 2000Kano and Ming 2000;van Heerden and Laurie 2008;Villordon et al 2010). The high productivity of sweet potato is due to the sink potential of the storage root Hozyo 1977;Hahn 1977).…”

Section: Introductionmentioning

confidence: 99%

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Ravi¹,

Chakrabarti²,

Makeshkumar³

et al. 2014

Horticultural Reviews: Volume 42

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Storage root formation and development in sweet potato [Ipomoea batatas (L) Lam. Convolvulaceae] is a complex process characterized by the cessation of root elongation, genesis of vascular cambium, anomalous and interstitial cambia, and increase in radial growth by increased cell proliferation and expansion concomitant with the massive deposition of starch and storage proteins that eventually result in storage root enlargement. Phytohormones play a crucial role in the formation of storage roots. Three class I knotted-like homeobox (KNOX1) genes-SRF1, SRF5, and SRF6-modulate carbohydrate metabolism and cell division. The genes Ibkn1 and Ibkn2 activate cytokinin biosynthesis. Transcription factors derived from MADS box genes IbMADS1, IbMADS3, IbMADS4, and IbAGL17 induce signal transduction pathway leading to storage root formation and development. The occurrence of SRD1 transcripts mainly in the actively dividing cells, including the vascular and cambium cells, and the increase in endogenous indole-3-acetic acid (IAA) content and three auxin-inducible AUX/IAA gene transcripts concomitantly with SRD1 transcripts suggest the involvement of SRD1 during the early stage of storage root development. Along with IbMADS1 induction, two storage root marker genes, which encode a major storage protein sporamin and IbAGPase that encodes AGPase for ADP-glucose production in starch biosynthesis, are up-regulated during the early period of storage root development. A class III HD-Zip protein 8 regulating the development of cambia and secondary vascular tissues, a short-root protein that is a key regulator in root 157 radial patterning, meristem maintenance, and asymmetric cell division, the expansin gene IbEXP1 encoding a cell wall loosening protein, genes encoding cyclin A-and cyclin D-like proteins, and five cyclin-dependent kinases are upregulated during storage root formation. Genes encoding ADP-glucose pyrophosphorylase, granule-bound starch synthase, starch synthase, and phosphoglucomutase are up-regulated, whereas genes encoding pyruvate decarboxylase and lactate dehydrogenase are down-regulated during storage root development. The endogenous sucrose levels influence the expression of two AGPase isoforms: ibAGP1 and ibAGP2. The expression of cell wall-bound (extracellular/apoplast) acid invertase activity gene (cwINV) predominates during early period, whereas the expression of cytosolic activity of sucrose synthase gene (SuSy) predominates during later period of storage root enlargement. The competition between lignification and formation of anomalous cambia and the associated starchaccumulating cells determine storage root development. Genes encoding enzymes such as coumaroyl-CoA synthase, caffeoyl-CoA O-methyltransferase, and cinnamyl alcohol dehydrogenase during storage root formation reduce lignification in tissue sections of storage roots.

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“…In sweet potato, it was observed that the water deficit reduces the number of leaves and tubers, the size and composition of roots and vines, and the gain of dry weight of shoot and roots (Bourke, 1989;Pardales et al, 2000). In the pot experiment to screen 15 sweet potato varieties for drought tolerance, Sarawasti et al (2004) observed that biomass and morphological traits such a main stem length, internode diameter and length, leaf area and number decreased in response to drought stress.…”

Section: Drought Stress On Sweet Potatomentioning

confidence: 99%

“…Soil water content is the main factor that determines the formation and growth of root tubers of sweet potato (Bourke, 1989). In field trials, it was observed that drought stress for 20 days in part of the growing period decreased the storage root yield by 15 to 39% (Gong and Wang, 1990).The constant soil humidity was proved to reduce adventitious roots (Pardales et al, 2000). In the water logging condition, the plants do not develop effective roots because underground parts of plant do not have enough oxygen to carry out metabolic reactions.…”

Section: Drought Stress On Sweet Potatomentioning

confidence: 99%

Physiological mechanisms and conventional breeding of sweet potato (Ipomoea batatas (L.) Lam.) to drought-tolerance

Rukundo¹,

Shimelis²,

Laing³

et al. 2013

Afr. J. Agric. Res.

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The paper is aimed at highlighting the physiological mechanisms associated with breeding of sweet potato towards drought tolerance. It describes important aspects including: the effects of drought stress, mechanisms of adaptation of crops to drought stress, drought stress on sweet potato, inheritance of drought tolerance, methods of screening and breeding of sweet potato for drought tolerance. The literature summarized in this paper may serve as important guideline in sweet potato breeding towards drought-tolerance.

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The Effect of Fluctuations of Soil Moisture on Root Development during the Establishment Phase of Sweetpotato

Cited by 13 publications

References 4 publications

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Development and Distribution of Root System in Two GrainSorghum Cultivars Originated from Sudan under Drought Stress

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Physiological mechanisms and conventional breeding of sweet potato (Ipomoea batatas (L.) Lam.) to drought-tolerance

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