Promotion of Flowering in<i>Sagittaria pygmaea</i>Miq. by 2,6-Diisopropylphenoxyacetic Acid

Kuramochi, Hitoshi; Yoshimura, Takumi; Miyazawa, Takeshige; Konnai, Makoto; Takematsu, Tetsuo; Yoneyama, Koichi

doi:10.1271/bbb.60.374

Cited by 5 publications

(7 citation statements)

References 1 publication

(1 reference statement)

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“…edulis with GA directly before planting and found that raceme production was promoted by this treatment. Kuramochi et al (1996) reported the promotion of raceme production on adding GA or a solution containing an artificial analogue to irrigation water after transplanting the juvenile plants of S. pygmaea. On the whole, exogenous GA may increase the number of racemes in Sagittaria species regardless of the differences in the methods of its application.…”

Section: Discussionmentioning

confidence: 99%

Modification of Sex Expression in Sagittaria latifolia by the Application of Gibberellic Acid and Paclobutrazol

忠芳¹

2007

J. Japan. Soc. Hort. Sci.

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A clear modification of sex expression in Sagittaria latifolia from male or trimonoecious to female was induced by a foliar spray of gibberellic acid (GA) at concentrations of 10, 100, and 1000 ppm. This modification began two weeks after the initiation of treatment. The effect was greater at a higher GA concentration. The number of racemes was increased by the treatment. On the other hand, male and perfect flowers were produced in the female line by a foliar spray of paclobutrazol (PBZ) at concentrations of 100 and 1000 ppm two weeks after the initiation of treatment, and a greater number of male flowers was produced in the trimonoecious line by the spray. The number of racemes was decreased by the PBZ application. GA was effective for the internode elongation of rachises and scapes; on the contrary, PBZ was effective in shortening the internodes. Therefore, it was clarified that endogenous GA controlled sex expression, raceme production, and internode length in this species. Female flowers in the male line developed into fruits with a normal seed; further, female flowers that had been pollinated with pollen grains from male flowers of the female line also developed into fruits with a normal seed. These results will be useful for the breeding of S. latifolia.

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Section: Discussionmentioning

confidence: 99%

Modification of Sex Expression in Sagittaria latifolia by the Application of Gibberellic Acid and Paclobutrazol

忠芳¹

2007

J. Japan. Soc. Hort. Sci.

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“…Arrowheads are an emergent plant and a perennial weed of rice fields in Japan (Suge & Kusanagi 1975; Kuramochi et al 1996a,b). The tubers, which form at the tip of the rhizomes in autumn, remain under the soil during winter and then sprout about 2 weeks after the paddy fields are watered in the following spring.…”

Section: Introductionmentioning

confidence: 99%

Growth and energy status of arrowhead tubers, pondweed turions and rice seedlings under anoxic conditions

Ishizawa

Murakami

Kawakami

et al. 1999

Plant Cell & Environment

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The responses of two aquatic plants, arrowhead (Sagittaria pygmaea Miq.) and pondweed (Potamogeton distinctus A. Benn), to anoxia were compared with those of rice (Oryza sativa L.). Shoot elongation of arrowhead tubers was enhanced at around 1 kPa O 2 , whereas that of pondweed turions was slight in air and reached a maximum in the absence of O 2 . Anaerobic enhancement of alcohol dehydrogenase (ADH) activity took place in rice coleoptiles but not in arrowhead and pondweed shoots. Shoots of both arrowhead and pondweed maintained a more stable energy status than did the rice coleoptile under anaerobic conditions. Total adenylate nucleotide contents of arrowhead and pondweed shoots were constant under anaerobic conditions. Adenylate energy charge in both shoots remained at a high and stable level of more than 0·8 for at least 8 d. Three forms of ADH from arrowhead shoots were separated by starch gel electrophoresis, showing that the activity of each ADH form was different under aerobic and anaerobic conditions. The incorporation of 35 S-labelled Cys and Met into soluble proteins in arrowhead shoots showed active protein biosynthesis and an involvement of a special set of polypeptides in the anaerobiosis.Key-words: Oryza sativa; Potamogeton; Sagittaria; adenylate energy charge; alcohol dehydrogenase; alcoholic fermentation; anaerobiosis; aquatic plants; growth in an anoxic state; protein synthesis in an anoxic state. INTRODUCTIONStudies on the responses of plants to anaerobic conditions are important to improve the productivity of cultivated plants in fields that are in danger of flooding. Therefore, many studies have been made on major crops such as tomato, barley, corn, soybean (Perata & Alpi 1993;Sachs, Subbaiah & Saab 1996;Vartapetian & Jackson 1997). These crops only survive a few days under anaerobic conditions because of lethal damage to their roots from exposure to anoxia. Studies of early events occurring in the cells of plants exposed to anaerobic conditions have focused on adenosine 5'-triphosphate (ATP) production, fermentation, protein synthesis, gene expression, and acidosis.It has been shown, on the other hand, that several aquatic plants exposed to anoxia have the ability not only to survive but even to elongate their shoots for a certain period (Crawford 1989;Kennedy, Rumpho & Fox 1992;Crawford & Braendle 1996;Vartapetian & Jackson 1997). This does not mean that all aquatic plants can tolerate an anaerobic environment. Instead most aquatic plants avoid anaerobiosis by developing a system to ventilate tissues under water (Armstrong 1979). Some aquatic plants, however, have been known to be tolerators of anoxia. The most extreme example of this is the overwintering shoots of Potamogeton pectinatus L., which can elongate under anaerobic conditions (Summers & Jackson 1994). In this study, we found that the shoots of arrowhead (Sagittaria pygmaea Miq.) tubers and pondweed (Potamogeton distinctus A. Benn.) turions can also grow under anaerobic conditions.Arrowheads are an emergent plant and a per...

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“…7) By contrast, inhibitors of GA biosynthesis, uniconazole and prohexadione, which block different steps in GA biosynthesis, inhibited flowering. 8) These results clearly indicate that flowering in this weed is controlled by endogenous GAs. Structural requirements of GAs for the promotion of flowering seem to be different from those for shoot growth.…”

Section: Introductionmentioning

confidence: 64%

“…In our previous study, we confirmed that GAs and DIPA promoted the shoot growth and flowering of S. pygmaea. 8) Furthermore, in the weed, the structural requirements for the promotion of shoot growth by GAs are different from those for flowering, suggesting that these two events depend on separate processes. 6) In this study, not only did DIPA promote shoot growth and flowering, but also slightly increased the number of leaves of S. pygmaea.…”

Section: Discussionmentioning

confidence: 99%

Interaction between 2,6-diisopropylphenoxyacetic acid (DIPA) and plant growth regulators on shoot growth and flowering of a perennial aquatic plant, Sagittaria pygmaea

Yoshimura¹,

Kuramochi

Yoneyama

et al. 2011

J. Pestic. Sci.

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2,6-Diisopropylphenoxyacetic acid (DIPA) as well as gibberellins (GAs) was found to promote shoot growth and flowering in a perennial paddy weed Saggitaria pygmaea. In this paper, plant growth regulators, which have phytohormonal activities including 2,4-D, S-abscisic acid (S-ABA), ethephon and benzyladenine (BA) or inhibitors of GA biosynthesis (paclobutrazol and prohexadione), were tested alone or in combination with DIPA to examine their effects on shoot growth and flowering in S. pygmaea. 2,4-D inhibited the shoot growth of S. pygmaea, increased the number of leaves, and reduced shoot elongation induced by DIPA. Ethephon increased shoot growth of the weed. On flowering of S. pygmaea, 2,4-D reduced the promotive effect induced by DIPA. In contrast, ethephon slightly enhanced the promotive effect. These results indicate that in addition to GAs, auxin and ethylene play roles in the shoot growth and flowering of S. pygmaea.

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Promotion of Flowering inSagittaria pygmaeaMiq. by 2,6-Diisopropylphenoxyacetic Acid

Cited by 5 publications

References 1 publication

Modification of Sex Expression in Sagittaria latifolia by the Application of Gibberellic Acid and Paclobutrazol

Modification of Sex Expression in Sagittaria latifolia by the Application of Gibberellic Acid and Paclobutrazol

Growth and energy status of arrowhead tubers, pondweed turions and rice seedlings under anoxic conditions

Interaction between 2,6-diisopropylphenoxyacetic acid (DIPA) and plant growth regulators on shoot growth and flowering of a perennial aquatic plant, Sagittaria pygmaea

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