Heat Stress during Flowering in Summer Brassica

Morrison, Malcolm J.; Stewart, D. W.

doi:10.2135/cropsci2002.7970

Cited by 189 publications

(82 citation statements)

References 23 publications

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“…In the current study, the T min (6.4°C) and T max (33.0°C) values observed for the PG and PTL also reflect the critical minima and maxima temperature stresses of 10°C (JinLing 1997) and 29.9°C (Morrison and Stewart 2002), respectively, during flowering. Temperatures beyond these thresholds caused severe reduction in PG and PTL in the current study, similar to previous studies that also reported pollen mortality and failure to set fruit in canola (Polowick and Sawhney 1988, Rao et al 1992, Morrison 1993, JinLing 1997, Angadi et al 2000, Morrison and Stewart 2002, Young et al 2004). Furthermore, Wood et al (2006) reported that the reduction in grain set and harvest index followed a similar trend with that of pollen viability in sorghum plants subjected to chilling treatment for 5 days at the pre-meiotic stage of anther development.…”

Section: Discussionsupporting

confidence: 65%

Assessment of Cold and Heat Tolerance of Winter‐grown Canola (Brassica napus L.) Cultivars by Pollen‐based Parameters

Singh

Kakani

Brand

et al. 2008

J Agronomy Crop Science

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Winter‐grown canola (Brassica napus L.) production is limited mostly by frost and winter kill in the southern canola‐growing regions of the United States. Tolerance to cold and heat were assessed by studying percentage of pollen viability (PV), in vitro pollen germination (PG) and pollen tube length (PTL) for 12 field‐grown cultivars. Freshly collected pollen from all cultivars were incubated on artificial solid growth media at a constant temperature ranging from 10 to 35 °C at 5 °C interval for 30 h to determine PG and PTL. A modified bilinear model best described the temperature response functions of PG and PTL. Canola cultivars showed significant variability (P < 0.001) for PV (61.3 % to 89.7 %), PG (29.0 % to 48.2 %) and PTL (463 to 931 μm). The average cardinal temperatures, Tmin, Topt and Tmax, for PG and PTL were 6.4, 24.3 and 33.7 °C, respectively. Principal component analysis revealed that maximum PG, PTL, Tmin and Topt of both PG and PTL were the most important factors in determining cold tolerance, whereas Tmax of PG and PTL, and maximum PG and PTL were more responsible in separating the cultivars for heat tolerance. The canola cultivar, KS3077, was the most cold tolerant with the lowest Tmin and the widest temperature adaptability range, and the cultivar Kadore was the most heat tolerant with the highest Tmax for the PG. The identified cold‐ and heat‐tolerant cultivars may be useful in canola‐breeding programmes to develop cultivars suitable for a niche environment.

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Section: Discussionsupporting

confidence: 65%

Assessment of Cold and Heat Tolerance of Winter‐grown Canola (Brassica napus L.) Cultivars by Pollen‐based Parameters

Singh

Kakani

Brand

et al. 2008

J Agronomy Crop Science

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“…Further, Rahnema & Bakhshandeh (2006) also reported that number of pods per plant, seed yield and oil content of rape are effect by the water deficiency and reduced under water stress conditions. Malcolm & Doug (2002) suggested the effect of the water deficit conditions on flower production and seed size and reported that water stress resulted in fewer flowers and seeds and produced seed are in small size. Lower number of branches, number of pods / plant and number of seed / plant was observed in different B. napus cultivars grown under water stress conditions and significant reduction in seed yield was observed when drought stress during flowering stage (Nasri et al, 2008).…”

Section: ____________________________________________________________mentioning

confidence: 99%

Impact of antioxidants supplementation on growth, yield and quality traits of canola (Brassica napus L.) under irrigation intervals in north nile delta of Egypt

El-Sabagh¹,

Abdelaal²,

Barutçular³

2017

JEBAS

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KEYWORDS Brassica napus Ascorbic acid Salicylic acid Irrigation Quality Yield ABSTRACTIn the present study, field experiments were carried out during the cropping seasons of 2012 and 2013 to examine the adverse effects of deficit irrigation on canola productivity and determining the role of ascorbic acid and salicylic acid (both of 200 ppm) in alleviating the adverse effects under deficit irrigation. Further, effects of these phytochemicals on canola growth, yield and quality characteristics were studied by imposing three irrigation intervals viz, 25 (I1), 35 (I2) and 45 (I3) days during both the growing seasons. The results of the study showed that the growth characteristics such as chlorophyll content and relative water content were decreased under the increase in irrigation intervals. Similarly, Yield and its components including plant height , silica number/plant, number of branches, seed number/ silica, seed yield/plant, seed yield / ha as well as, seed oil content of canola plant were decreased with increasing the intervals of irrigations. Application of both of phytochemical (salicylic acid and ascorbic acid) not only reversed the negative impact of water deficit conditions but also improved the growth and yield parameters of canola plant. However, the applications of antioxidants were more effective under the second irrigation intervals (I2) for both the cropping seasons. The maximum seed yield /ha, protein and oil yield was achieved by the applications of both antioxidants combined with irrigation every 35 days. From results of this study, it can be conclude that application of antioxidants could mitigate the harmful effects of deficit irrigation of canola. Accordingly, antioxidants supplementation could enhance the growth, yield and quality traits of canola under the increase of irrigation intervals in North Nile Delta.

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“…PUT increased the number of single-seeded pods to 12.2 while those of doubleseeded pods was reduced to 4.3. Chilling stress may induce abscission/abortion of flowers and pods because of several reasons that include impaired fertilization (Morrison and Stewart 2002), reduction in availability of photoassimilates because of damage to photosynthetic mechanism, decrease in sucrose mobilization ) and elevation of ethylene (Saftner andBaldi 1990, Huberman et al 1997). In chickpea, it could occur either as a result of failure of pollen and stigmatic functions (Srinivasan et al 1999, Croser et al 2003 or because of restriction of sucrose supply to flowers and pods coupled with increase in abscisic acid in reproductive organs .…”

Section: Effect Of Put On Stress At Flowering Stagementioning

confidence: 99%

Putrescine Increases Floral Retention, Pod Set and Seed Yield in Cold Stressed Chickpea

Nayyar¹

2005

J Agronomy Crop Science

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Chickpea (Cicer arietinum L.) is sensitive to cold stress (<8°C) at its reproductive phase that results in flower abortion, poor pod set and thus reduced yield. Early maturing genotypes are especially more sensitive. In this crop, the metabolic causes underlying cold injury that are imperative to induce cold tolerance are not known. In the present study, the endogenous levels of putrescine (diamine), spermidine (triamine) and spermine (tetramine) were examined in early maturing chickpea genotype ICCV 96029, subjected to chilling temperatures of field (12-15/ 4-6°C; average maximum and minimum temperature respectively), at flowering or early podding stage. These were compared with controls growing in warmer conditions (28/12°C) of the glasshouse. The polyamine levels increased six to nine times because of stress. Relatively, putrescine (PUT) elevation was the highest but short-lived and its decrease appeared to match with the onset of flower and pod abscission in stressed plants. Compared with controls, chilling injury, observed as electrolyte leakage (EL), increased by 60 % while cellular respiration declined by 68 % in stressed plants. Exogenous application of 10 mm PUT to stressed plants reduced the EL by 29 % and elevated the cellular respiration by 40 %. PUT application at flowering stage resulted in increase of 30, 31, 23 and 25 % in floral retention, pod set, pod retention and fertile pods respectively. At the early podding stage, PUT treatment increased the seed yield per plant, seed number per 100 pods and individual seed weight by 50, 17 and 19 % respectively. The number of single-seeded pods per plant increased from 4.4 in stressed plants to 12.2 in PUT-treated plants while the number of double-seeded pods reduced from 6.2 to 4.3. The number of infertile pods declined from 8.2 in stressed plants to 3.1 in PUTtreated plants.

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Heat Stress during Flowering in Summer Brassica

Cited by 189 publications

References 23 publications

Assessment of Cold and Heat Tolerance of Winter‐grown Canola (Brassica napus L.) Cultivars by Pollen‐based Parameters

Assessment of Cold and Heat Tolerance of Winter‐grown Canola (Brassica napus L.) Cultivars by Pollen‐based Parameters

Impact of antioxidants supplementation on growth, yield and quality traits of canola (Brassica napus L.) under irrigation intervals in north nile delta of Egypt

Putrescine Increases Floral Retention, Pod Set and Seed Yield in Cold Stressed Chickpea

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