Relations between root system and tuber yield in the hybrid population of the potato plants.

Iwama, Kazuto; Nakaseko, Kimio; Isoda, Akihiro; Gotoh, Kanji; Nishibe, Yukio

doi:10.1626/jcs.50.233

Cited by 15 publications

(8 citation statements)

References 9 publications

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“…The geno- types used in the present study represented the different possible combinations of root dry weight and foliage maturity. A genotype with high or medium root dry weight and early maturity is perhaps too difficult to find (Iwama et al 1981).…”

Section: Discussionmentioning

confidence: 99%

Effect of water stress mediated through agar on in vitro growth of potato

Gopal

Iwama

Jitsuyama

2008

In Vitro Cell.Dev.Biol.-Plant

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With the objective to develop a practical method of screening potato for drought tolerance, shoot and root growth in plantlets raised in vitro (from nodal cuttings drawn from in vivo as well as in vitro grown plantlets) were studied in three genotypes with known root mass production under field conditions. Different levels of water stress were induced using five concentrations of agar in MS (Murashige and Skoog in Physiol Plant 15:473-497, 1962) medium. Water potential of various media ranged from −0.70 MPa to −0.98 MPa. Water stress in culture adversely affected plantlet growth, and the responses varied with genotype and explant source. Genotype IWA-1 was less affected than Konafubuki and Norin-1. In the experiment with explants from in vivo grown plants, the time to rooting was considerably delayed in Konafubuki and Norin-1 by an increase in agar concentration, but no such effect was observed in IWA-1. In all media, the mean number of roots and root length was greater in IWA-1 than Konafubuki and Norin-1, and the latter two genotypes were at par. At 10 gl −1 agar, IWA-1 had taller plantlets, heavier foliage dry weight, root volume, as well as root dry weight than Konafubuki and Norin-1, whereas the latter two genotypes were at par for all these characteristics. This pattern was similar to the reported pattern of these genotypes for root dry weight under field conditions. However, such similarity in the in vitro and field behavior of the tested genotypes was not observed when nodal cuttings drawn from in vitro plantlets were used as explants. It is concluded that in vitro screening of potato under specific and limited water stress conditions by raising plantlets from nodal cuttings drawn from in vivo grown plants may provide a system for effectively differentiating the genotypes for their expected root mass production under field conditions.

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Section: Discussionmentioning

confidence: 99%

Effect of water stress mediated through agar on in vitro growth of potato

Gopal

Iwama

Jitsuyama

2008

In Vitro Cell.Dev.Biol.-Plant

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“…The significance of the root system size for yield formation is conflictingly discussed in the literature (Iwana et al, 1981;Peters et al, 1982). It has been suggested that this is mainly due to variations in the experimental conditions such as soil type, soil humidity and soil fertility.…”

Section: Discussionmentioning

confidence: 99%

“…The importance of a well developed root system size for achieving high tuber yields in potato plants has, however, been stressed by several authors (Harris, 1982;Iwana et al, 1981;Zillmann, 1959).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tuber bearing Solanum species belonging to different ploidy levels for its yielding potential at low soil fertility

Sattelmacher

Kuene²,

Malagamba

et al. 1990

Plant Soil

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Virus free tubers from thirty-six clones of tuber bearing Solanum species belonging to different ploidy levels, from the world gene bank at the International Potato Center, were cultivated under field conditions at low and high fertilizer rates. Nine of the clones were chosen for their high yielding potential (advanced group) and twenty-seven for their extensiveness (native group). The tuber yields of the thirty-six clones at the two fertilizer levels were positively correlated and the advanced group yielded more than the native group, even under conditions of low soil fertility.A broad genetic variation in root size at both fertilizer levels was apparent. Although some native clones showed rather large root systems as a group, the advanced clones had a similar root dry weight to the native clones.Tuber dry weight was significantly correlated with root dry weight but the advanced clones had a higher tuber yield per unit of root dry matter produced.

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“…Late genotypes continue root growth longer, and attain larger root mass and deeper root distribution than early genotypes (Iwama 1998;Stalham and Allen 2001). Root mass during the growing season generally shows positive correlations with shoot mass and final tuber yield in various cultivars (Iwama et al 1979) and breeding clones (Iwama et al 1981a) of different maturity classes. These differences in root mass become clear at the start of flowering, much earlier than those in shoot mass, and are relatively stable over locations (Iwama et al 1980).…”

Section: Root Pruning and Grafting Plantsmentioning

confidence: 97%

“…Variation of root dry weight (DW) in the plow layer and other plant characteristics among 268 hybrid clones derived from six crosses(Iwama et al 1981a) …”

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confidence: 99%

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

2008

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Potato roots are concentrated mostly in the plow layer up to 30 cm in soil depth. Some roots extend up to 100 cm depth and the total root length throughout the soil profile reaches about 10-20 km m −2 area. There are large differences in root mass (dry weight and length) in the plow layer between cultivars, breeding lines and wild relatives. The differences are generally stable across different environmental conditions, such as locations with different soil types, fertilizer rates and planting densities. Under favourable environmental conditions without severe shortage of water and nutrients, root mass differences between genotypes are related to maturity class: late genotypes continue root growth longer, and attain larger root mass and deeper rooting than early genotypes. Differences in root mass become clear at the start of flowering, much earlier than differences in shoot mass. Root mass is negatively correlated with early tuber bulking. However, root mass generally shows positive correlations with shoot mass and final tuber yield. Differences in root mass also exist amongst genotypes of the same maturity class. Using root mass in the plow layer and tuber yield as selection criteria, Konyu cultivars were bred in Japan. They showed significantly less reduction of leaf conductance and photosynthesis, leaf area and tuber yield than commercial cultivars under dry soil conditions. To assist breeding for root characters, new methods have been developed to assess the ability of roots to penetrate into hard soil layers using pots with paraffin-vaseline discs and the ability to absorb under low water potential in vitro. Physiological research on root characteristics contributed in the past, and will continue to do so in the future, to the development of new cultivars with high drought tolerance and to the improvement of irrigation practice.

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Relations between root system and tuber yield in the hybrid population of the potato plants.

Cited by 15 publications

References 9 publications

Effect of water stress mediated through agar on in vitro growth of potato

Effect of water stress mediated through agar on in vitro growth of potato

Evaluation of tuber bearing Solanum species belonging to different ploidy levels for its yielding potential at low soil fertility

Physiology of the Potato: New Insights into Root System and Repercussions for Crop Management

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