Photoperiodische Untersuchungen an Kartoffelsämlingen.

Kopetz, L. M.; Steineck, O.

doi:10.1007/bf00709850

Cited by 23 publications

(3 citation statements)

References 5 publications

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“…The tuberization stimulus is favored by photoperiods shorter (8) than a critical photoperiod, the length of which varies with genotype (13,15 MATERIALS AND METHODS Clones. Potato ( Solanum tuberosum L., Group Andigena) clones used in this study were obtained through the Cornell University program to select from an Andigena population lines that have Tuberosum-like characteristics (6).…”

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Shoot, Stolon, and Tuber Formation on Potato (Solanum tuberosum L.) Cuttings in Response to Photoperiod

Ewing¹,

Wareing²

1978

Plant Physiol.

115

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The intensity of "tuberization stimulus" in potato shoots (Solanum tuberosum L.) can be assessed from cuttings containing one or more leaves. Cuttings maintained in a mist chamber under long days wil form tubers from underground buds If prior to taking the cutting the leaves received sufficient exposure to photoperiods less than the critical photoperiod. The greatest tendency to tuberize was found in cuttings that consisted of a single, fully expanded leaf and its subtended bud. Grafts showed that genetical differences in critical photoperiod resided in properties of the leaf. Short days before cutking tended to shift growth from above ground buds of two-node cuttings to below ground buds, even if the number of short days was insufficient for tuber induction. As few as 6 short days reduced growth of shoots at the upper bud and increased underground growth of shoots and stolons.however, and this trait can be accentuated by breeding (9, 21). In addition to short days, the tuberization stimulus is favored by cool temperatures (3, 11,22,24), by low rather than high rates of N fertilization (24), and by "physiologically old" mother tubers (15,18).Grafting experiments (5, 10), especially the demonstration that even a small piece of stem from an induced plant is capable of transmitting the tuberization stimulus (14), suggest that the stimulus is hormonal in nature. The exact identity of the hormone(s), although extensively investigated, has yet to be established.In this paper we report on the relationships between the exposure of potato foliage to particular photoperiods, the genetically determined CPP, and the levels of tuberization stimulus as reflected by tuberization of cuttings. We show that the CPP characteristic of a given clone is a function of properties of the leaf, not of the underground growing point; and we present evidence that short days shift growth from above ground to below ground buds, even if the number of short days is insufficient for tuber induction. Although potato tubers ordinarily form on underground stolons, every axillary bud on a potato stem has the potential to develop a tuber. Nearly a century ago, Vochting (23) demonstrated that sessile tubers developed at the covered nodes when cut pieces of stem were inserted into soil. He also showed that tuber formation was promoted by darkness and moisture. Recent evidence (16,17) suggests that elevated CO2 levels may also favor tuberization at below ground rather than above ground buds. However, tubers do not always develop even from underground buds of cuttings. As with whole plants, tuberization of cuttings is apparently controlled by an unknown "tuberization stimulus" (5,10,19 MATERIALS AND METHODS Clones. Potato ( Solanum tuberosum L., Group Andigena) clones used in this study were obtained through the Cornell University program to select from an Andigena population lines that have Tuberosum-like characteristics (6). Andigena accessions were screened to obtain three clones with CPP of approximately 12 to 13 hr. Populations of "Neo-Tuber...

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confidence: 99%

Shoot, Stolon, and Tuber Formation on Potato (Solanum tuberosum L.) Cuttings in Response to Photoperiod

Ewing¹,

Wareing²

1978

Plant Physiol.

115

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“…Certain pea cultivars show a quantitative lelay in flowering when subjected to short photoperiods, whereas othen are insensitive or day neutral, the later varieties being responsive and the early varieties being insensitive (Kopetz, 1938(Kopetz, : 1941Reath and Wittwer, 1952;Paton and Barber, 1955;Hansel, 1954;Went . 1957;Barber, 1959 ;Van Dobben, 1963;Rowlands.…”

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Influence of Genotype and Environment on Senescence in Peas, Pisum sativum L.

Marx¹

1968

BioScience

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“…It was reported that tuberisation in LD is inhibited by the photoreceptor PHYTOCHROME B (PHYB), though it is not responsible for induction of tuberisation in SD (Jackson, 1999). Studies suggested that differences found in the tuberisation in different cultivars of potato largely varies with the CDL (Kopetz and Steineck, 1954). It was observed that tuberisation occurred in potato when tobacco leaves from a floweringinduced plant were grafted onto potato plants kept under non-inductive conditions, which suggested that the genetic control of tuberisation is similar to the genetic control of photoperiodic flowering (Jackson, 1999).…”

Section: Speciesmentioning

confidence: 99%