Pearl, Altai wild ryegrass

Lawrence, T.; Jefferson, P. G.; Ratzlaff, C. D.

doi:10.4141/cjps91-080

Cited by 8 publications

(5 citation statements)

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“…These forty‐two HTN and eighteen LTN half‐sib families and four control cultivars, Prairieland, Pearl (Lawrence et al ., 1991a) and Eejay (Lawrence et al ., 1991b) Altai wildrye, and Nordan crested wheatgrass (Alderson and Sharp, 1994), were sown in an eight × eight lattice design with three replications on 23 May 1991 on dryland and on 27 May 1991 on irrigated land at 100 pure live seed (PLS) m –1 of row. Prairieland was included as a control cultivar because it was the base population for the recurrent selection programme.…”

Section: Methodsmentioning

confidence: 99%

Divergent recurrent selection for seedling tiller number in Altai wildrye

Jefferson

Lawrence²,

Kielly

2001

Grass and Forage Science

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Seedling tiller number is a possible selection criterion to improve seedling establishment of Altai wildrye, Leymus angustus (Trin.) Pilger, an important grass for autumn grazing of beef cattle in semiarid environments. Forty‐two half‐sib families selected for high seedling tiller number (HTN) and eighteen half‐sib families selected for low seedling tiller number (LTN) by four cycles of divergent recurrent selection were compared with four controls, Altai wildrye cultivars Prairieland, Eejay and Pearl, and crested wheatgrass (Agropyron desertorum (Fisch. Ex Link) Schultes), cultivar Nordan, on dryland and irrigated sites at Swift Current, Saskatchewan, Canada. Seedling tiller count, seedling height, tiller weight and seedling dry‐matter yield (DMY) were determined on two plants per plot and DMY was determined for each plot for 2 years post‐establishment. HTN half‐sib families had more, lighter and shorter tillers than LTN half‐sib families. There was a negative correlation (r=–0·42, P < 0·01, n=60) between seedling DMY and tiller number. HTN half‐sib families had higher DMY in post‐establishment years at the dryland site only. Seedling tiller number in Altai wildrye may be related to DMY at sites at which resource availability delays seedling establishment, but selection for HTN will not increase seedling DMY owing to concomitant changes in carbon allocation.

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Section: Methodsmentioning

confidence: 99%

Divergent recurrent selection for seedling tiller number in Altai wildrye

Jefferson

Lawrence²,

Kielly

2001

Grass and Forage Science

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“…Eejay is similar to Prairieland (Lawrence 1976) and Pearl (Lawrence et al 1991) in appearance except that a majority ofthe plants (75%) have nonglaucous (green) foliage.…”

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confidence: 89%

Eejay, Altai wild ryegrass

Lawrence¹,

Jefferson²,

Ratzlaff³

1991

Can. J. Plant Sci.

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“…A separate randomized complete block trial of three AWR cultivars that vary in glaucous appearance was seeded adjacent to the synthetic trial and similar data were collected. The cultivars were Prairieland, a variably glaucous cultivar (Lawrence 1979), Pearl, a glaucous cultivar (Lawrence et al 1991a), and Eejay, nonglaucous cultivar (Lawrence et al 1991b).…”

Section: Selection For High or Low Ew Concentration Within Glaucous Amentioning

confidence: 99%

Leaf epicuticular wax and glaucousness in Altai wildrye grass: which trait is most important to water status?

Jefferson¹

2008

Can. J. Plant Sci.

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Jefferson, P. G. 2008. Leaf epicuticular wax and glaucousness in Altai wildrye grass: which trait is most important to water status? Can. J. Plant Sci. 88: 447Á455. Epicuticular wax (EW) concentration on the outermost layer of the plant cuticle increases in response to drought stress for many xeric plant species. Glaucousness, or the visible (blue) waxiness of leaf surfaces, is associated with greater EW concentration compared with nonglaucous (green) plants of Altai wildrye grass [Elymus angustus (Trin.) Pilger] (AWR). The contributions of EW concentration and glaucousness to drought stress response have been confounded in previous research. The objective of this study was to determine the effects of EW concentration and glaucousness on water relations of AWR. Water loss rate (WLR) of excised leaves was determined for 180 half-sib AWR lines in 1988AWR lines in , 1989AWR lines in and 1990 at Swift Current, Saskatchewan, Canada. The mean WLR of blue half-sib lines was 36% less than green half-sib lines (PB0.05). Among blue (n 060) or among green (n060) half-sib lines, however, there was no significant correlation between WLR and EW concentration. Leaf water potential (C) was determined for 10 blue and 10 green half-sib lines in 1988, 1989 and 1990. Predawn leaf C was 18% higher for blue half-sib lines than for green half-sib lines (PB0.01), but there was no correlation between C and EW concentration within either group of halfsib lines. Four contrasting synthetics were generated by inter-crossing parent plants that had high or low EW production within either phenotype. The EW concentration, forage yield, predawn C, and midday C were determined for these four synthetics for three sampling dates per year from 1996 to 2001. Selection for high and low EW concentration shifted this trait (PB0.01) by 0.19 g m (2 between glaucous synthetics and by 0.07 g m (2 between nonglaucous synthetics. Glaucous synthetics exhibited improved predawn C by 0.05 MPa and predawn turgor potential (P) by 0.08 MPa (P B0.05) compared with nonglaucous synthetics. However, selection for high and low EW concentration did not affect predawn C nor predawn P in either glaucous or nonglaucous synthetics. Selection for blue glaucousness in AWR altered water relations, but selection for EW concentration did not.Key words: Forage breeding, range improvement, forage yield, drought stress, water potential, turgor potential, epicuticular wax Jefferson, P. G. 2008. Cire e´picuticulaire et couleur glauque des feuilles de l'e´lyme e´troite : quel caracte`re a le plus d'importance pour le bilan hydrique? Can. J. Plant Sci. 88: 447Á455. Chez maintes espe`ces xe´riques, la concentration de cire e´picuticulaire (CE) sur la couche externe du cuticule s'accroıˆt avec le stress cause´par la se´cheresse. Chez l'e´lyme e´troite (Elymus angustus (Trin.) Pilger), on associe la couleur glauque ou l'aspect cireux (bleu) des feuilles a`une plus grande concentration de CE, comparativement aux plants verts (non glauques) de la meˆme espe`ce. Les recherches ante´rieures...

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Pearl, Altai wild ryegrass

Cited by 8 publications

References 1 publication

Divergent recurrent selection for seedling tiller number in Altai wildrye

Divergent recurrent selection for seedling tiller number in Altai wildrye

Eejay, Altai wild ryegrass

Leaf epicuticular wax and glaucousness in Altai wildrye grass: which trait is most important to water status?

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