The relationship between acquired resistance to Peronospora tabacina in Nicotiana tabacum and soil nitrogen levels

When plants (Nicotiana tabacum L. cv. Virginia Gold) were supplied with suboptimal levels of nitrogen, the acquired resistance to blue mould (Peronospora tabacina Adam) evoked by injection of spore suspensions of the same pathogen into stems was associated with dwarfing, reduction in leaf areas, nitrogen deficiency-like symptoms, and premature senescence. However, when plants were supplied with adequate nitrogen, no morphological changes were associated with acquired resistance. The protective effect of stem injection against subsequent leaf infection was shown to be persistent and not affected by plant vigour, age, or soil nitrogen level. The protective effect of stem injection against subsequent leaf infection was shown to be persistent and not affected by plant vigour, age, or soil nitrogen level.

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Acquired systemic resistance to tobacco mosaic virus in Nicotiana tabacum evoked by stem injection with Peronospora tabacina Adam

Australian Journal of Agricultural Research ◽

10.1071/ar9630315 ◽

1963 ◽

Vol 14 (3) ◽

pp. 315 ◽

Cited By ~ 22

Author(s):

M Mandryk

Keyword(s):

Nicotiana Tabacum ◽

Tobacco Mosaic Virus ◽

Mosaic Virus ◽

Systemic Resistance ◽

Peronospora Tabacina ◽

Nicotiana Tabacum L ◽

Stem Injection ◽

The Difference ◽

And Control

Resistance to tobacco mosaic virus (TMV) was induced in leaves of Nicotiana tabacum L. (cv. Xanthi and cv. Havana 423) by injecting spore suspensions of Peronospora tabacina Adam into the stems of plants. TMV lesions that developed on the leaves of stem-injected plants were 62% smaller and 32% fewer in number than their counterparts in control plants. While the difference in numbers of lesions on the leaves between injected and control plants decreased from the bottom to the top of the plant, the difference in the size of lesions was maintained at all leaf levels.

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Induction of gene expression for systemic acquired resistance in tobacco by 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid (KODA)

Canadian Journal of Plant Science ◽

10.4141/cjps2013-060 ◽

2013 ◽

Vol 93 (5) ◽

pp. 827-830

Author(s):

Jyun-ichi Endo ◽

Wataru Takahashi ◽

Mineyuki Yokoyama ◽

Osamu Tanaka

Keyword(s):

Gene Expression ◽

Nicotiana Tabacum ◽

Systemic Acquired Resistance ◽

Octadecadienoic Acid ◽

Acquired Resistance ◽

Lemna Paucicostata

Endo, J., Takahashi, W., Yokoyama, M. and Tanaka, O. 2013. Induction of gene expression for systemic acquired resistance in tobacco by 9-hydroxy-10-oxo-12( Z ),15( Z )-octadecadienoic acid (KODA). Can. Plant Sci. 93: 827–830. The reaction of 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid (KODA) with (–)-norepinephrine (NE) generates the flowering inducer FN1 of duckweed Lemna paucicostata, although KODA and NE themselves do not promote flowering. We examined the effects of FN1, KODA, and NE on the induction of gene expression for systemic acquired resistance (SAR) in tobacco (Nicotiana tabacum) leaves and found that KODA induces the expression of SAR related genes.

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Effect of Nitrogen Nutrition Upon Sugar Content and Dry Weight of Juvenile Lodgepole Pine and White Spruce

Canadian Journal of Forest Research ◽

10.1139/x72-066 ◽

1972 ◽

Vol 2 (4) ◽

pp. 434-440 ◽

Cited By ~ 6

Author(s):

Harold M. Etter

Keyword(s):

Species Interactions ◽

Nitrogen Nutrition ◽

Sugar Content ◽

Nitrogen Deficiency ◽

Dry Weight ◽

Nitrogen Level ◽

Growth Responses ◽

Free Sugars ◽

Glucose Levels ◽

Physiological Processes

A factorial experiment was conducted in which Pinuscontorta var. latifolia and Piceaglauca (Moench) Voss seedlings were grown for 6 weeks under controlled environmental conditions with deficient and normal supplies of nitrate and ammonium. Free sugars (sucrose, fructose and glucose), starch (as glucose) and pectic sugars (galactose, arabinose, mannose and xylose) were quantitated. Effects of nitrogen form and nitrogen level, and their interactions, upon sugar contents and dry weights of the two species were examined. Growth responses to nitrogen occurred mainly in the shoots. For most parameters the two species reacted similarly to changes in nitrogen level and form, although the concentration of individual sugars differed between the species. In the shoots there were level × species interactions in the dry weight and the sum of free sugars plus starch. Plants grown under nitrogen deficiency were characterized by higher starch contents throughout and lower free sugars in the shoots. Supplying nitrate instead of ammonium lowered glucose levels, particularly in the shoots. Pectic sugar contents were unaffected by nitrogen nutrition. These compositional and growth responses to the nutritional regime implied changes in carbohydrate metabolism and physiological processes that are described by the C/N ratio of the plant.

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The effect of increased soil nitrogen associated with medic ley on the performance of a standard and a semi-dwarf wheat cultivar

Australian Journal of Experimental Agriculture ◽

10.1071/ea9730063 ◽

1973 ◽

Vol 13 (60) ◽

pp. 63 ◽

Cited By ~ 3

Author(s):

CL Tuohey

Keyword(s):

Grain Size ◽

Soil Nitrogen ◽

Harvest Index ◽

Wheat Cultivar ◽

The Other ◽

Nitrogen Level ◽

Plant Nitrogen ◽

Dwarf Cultivar ◽

Standard Cultivar ◽

Better Than

Two cropping rotations of fallow-wheat and four years of barrel medic (Medicago truncatula) pasture were used to obtain two levels of soil total nitrogen on a grey clay at Longerenong College, Dooen, Victoria. A semi-dwarf cultivar, Mexico 120, and a standard cultivar, Olympic, were then compared at the two levels of soil nitrogen over four years from 1964 to 1967. Mexico 120 outyielded Olympic by 1490 kg ha-1 in 1964 at the higher soil nitrogen level; however, it did not yield any better than Olympic at low soil nitrogen in that year nor at either soil nitrogen level in the other years. Mexico 120 had higher tiller survival, larger grain size, and shorter straw than Olympic in all years. In 1965 and 1966 its harvest index and the percentage of plant nitrogen in the grain responded more to higher soil nitrogen than that of Olympic.

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