Mother tuber reserves as factors limiting potato sprout growth

Davies, Howard V.

doi:10.1007/bf02357468

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…Although starch degradation is thought to accompany the onset of sprouting, the starch content was unaltered throughout the storage period regardless whether the tubers of the different varieties had already started to sprout or not (Table 1). Davies (1984) could also not show any starch degradation when sprouting occurred, whereas Davies & Ross (1987) as well as Duwenig et al (1997) found decreasing amounts of starch with increasing storage duration. However, our results revealed that the appearance of sprouts did not coincide with a decline in starch content.…”

Section: Resultsmentioning

confidence: 65%

Comparative analysis of abscisic acid content and starch degradation during storage of tubers harvested from different potato varieties

et al. 2000

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SummarySeveral lines of evidence suggest a prominent role of abscisic acid in controlling the length of the dormancy period of potato tubers. The ABA content was measured in tubers of six different potato varieties during storage. Consistent with previous publications a continuous decline in ABA content during storage was evident. However, this decline of ABA did not correlate with the sprouting behaviour of the tubers, ruling out that ABA is responsible for the break of dormancy. Activities of starch degrading and glycolytic enzymes were deterriained to investigate whether changes in their activities would correlate with the break of dormancy. Most of the enzymes investigated did not change significantly during storage. After the onset of sprouting activity of beta-amylase increased two-fold and alpha-amylase activity was stimulated by approximately 30%. The increase in beta-amylase activity was due to transcriptional activation, as shown by northern analysis. Since no change of starch degrading enzymes could be detected prior visible sprout growth, starch degradation is not a prerequisite for the initiation of sprouting.

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Section: Resultsmentioning

confidence: 65%

Comparative analysis of abscisic acid content and starch degradation during storage of tubers harvested from different potato varieties

et al. 2000

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“…Thirdly, differences in yield potential may be due to differences in seed tuber composition and reserves (Davies 1984) manifest in the dry matter content (Wiersema & Booth 1985). Our warm-origin tuber materials generally had low dry matter contents at harvest (LT-5 16-17%, Desiree 15%) which were c. 20-25% lower than those attainable at the cool highland site.…”

Section: Field Experimentsmentioning

confidence: 85%

Planting materials for warm tropic potato production: production and field performance of nursery-produced tubers

1996

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S U M M A R YPotato production in the lowland tropics is constrained by lack of affordable supplies of planting material. Therefore, the potential to produce in situ tuber seed from true potato seed (TPS) seedlings and rooted stem cuttings under nursery conditions in the warm tropics was studied, and their yields were compared with those of the same materials obtained under cool conditions. Subsequently, their field performance in the warm tropics was evaluated.Tuber yield from TPS seedlings and rooted cuttings transplanted in nursery beds under warm conditions ranged from 50 % to < 20 % of that obtained in cool conditions, but reductions in tuber numbers were less marked under warm conditions. Survival of seedlings was less than that of stem cuttings, but tuber numbers of seedlings exceeded those of rooted cuttings by a factor of two or more (e.g. 700 m~2 for seedlings v. 224 m~2 for rooted cuttings). Low tuber number is physiologically inherent in cuttings, as is high tuber number in seedlings. Total tuber yields varied significantly amongst clones grown in the warm climate from rooted cuttings, not always in proportion to the number of tubers produced. Differences in tuber yield and tuber number were less marked between the two TPS progenies studied.The field comparisons highlighted the 30-40 % lower yield potential for warm-climate-produced nursery seed materials. Slower emergence and fewer stems apparently were in part responsible for this effect; however, neither tuber number harvested nor the proportion of marketable tubers was affected by site of production of seed materials. Cutting medium-sized warm-produced tubers (mean 23 g), the use of larger sized whole tubers (10-20 g v. 5-10 g) or increasing the planting density of 5 g tubers from 8-8 to 15-5 plants n r 2 significantly increased yields by 4-9, 2-25 and 3-5 t ha" 1 , respectively, but yields were not increased further by 20-40 g tubers nor by 22-2 plants m~2. Small seedling tubers (< 5 g) can potentially lead to high stem numbers per unit weight of tubers, but their success in plant establishment was hampered in warm climates, especially in the presence of soil pathogens. Cool-climate-produced seedling tubers and tubers from cuttings can compete physiologically with field-produced seed tubers when used as planting materials in the warm tropics. However, with few exceptions, no crop from tubers produced under warm conditions could match the performance of crops from similar cool-produced tubers when planted out in the warm tropics.

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“…Then the suspension was centrifuged at 3000 g for 15 min at 4 ~ and the total protein content was determined by the method of Peterson (1977). Free amino acids were extracted as described by Davies (1984) and determined with the ninhydrin reagent, according to Yemm & Cocking (1955) using leucine as a standard. Starch was extracted and analyzed enzymatically using the procedure of Beutler (1984).…”

Section: Methodsmentioning

confidence: 99%

Nutritional value of potato tubers from field grown plants treated with deltamethrin

2000

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SummaryTubers showed changes in their nutritional value caused by the treatment of the plants with the insecticide deltamethrin. The level of starch was increased in comparison with control tubers; but the amylose percentage was not affected. In contrast, the total protein content decreased in tubers from treated plants, whereas free amino acids level and ascorbic acid content increased. The results showed that the changes in the tubers caused by the treatment of potato plants with deltamethrin did not adversely affect the nutritional value of the progeny tubers.

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Mother tuber reserves as factors limiting potato sprout growth

Cited by 17 publications

References 14 publications

Comparative analysis of abscisic acid content and starch degradation during storage of tubers harvested from different potato varieties

Comparative analysis of abscisic acid content and starch degradation during storage of tubers harvested from different potato varieties

Planting materials for warm tropic potato production: production and field performance of nursery-produced tubers

Nutritional value of potato tubers from field grown plants treated with deltamethrin

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