Determination of Viability of Passion Fruit Pollens
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摘要:
目的 明确西番莲属植物花粉最佳离体培养基、离体培养最适观测时间、花粉的最适染色法和花粉贮藏条件,快速精准鉴定西番莲属种质资源的花粉活力,为其种质资源利用与新品种选育提供科学依据。 方法 以6份西番莲属种质资源的花粉为试验材料,设计正交试验,探究不同浓度的蔗糖、H3BO3、Ca(NO3)2和聚乙二醇-4000(PEG-4000)对花粉离体萌发率的影响;利用最佳花粉离体培养基,筛选花粉离体培养最适观测时间;采用I2-KI染色法、TTC染色法与亚历山大染色法,探究最适的西番莲花粉染色法;通过不同贮藏温度与时间处理,筛选花粉的最佳贮藏条件。 结果 正交试验筛选出最佳培养基配方为100 g·L−1 蔗糖+0.04 g·L−1 H3BO3+0.01 g·L−1 Ca(NO3)2+150 g·L−1 PEG-4000+200 mg·L−1 MgSO4·7H2O+100 mg·L−1 KNO3,pH值5.5;花粉离体培养1 h为最适观测时间;TTC染色法染色效果好且结果与离体萌发率无显著差异,可有效检测西番莲花粉活力;花粉贮藏24 h以内,25 ℃与4 ℃的贮藏温度下花粉活力分别为30.48%、26.69%,花粉贮藏时间在1~7 d,4 ℃下花粉活力仍保持在26.54%~27.05%。 结论 筛选出西番莲属植物花粉离体萌发的最佳培养基组合、离体培养最适观测时间、花粉最适染色法与花粉贮藏最佳条件,为西番莲属植物花粉活力的快速筛选和品种改良提供理论依据。 Abstract:Objective Method for determining the viability of passion fruit pollens was explored to facilitate the utilization of existing germplasms and breeding new varieties. Methods Medium and conditions for in vitro culture of Passiflora pollens was optimized. Appropriate staining methods to determine and storage conditions to maximize the pollen viability were investigated. Contents of sucrose, H3BO3, Ca(NO3)2, and polyethylene glycol-4000 (PEG-4000) of the medium were optimized in an orthogonal experiment on pollens of 6 germplasms. Pollen germination on the finalized medium for varied culture times was observed. The staining of I2-KI, TTC, and Alexander methods and storage for different durations at different temperatures were compared. Results The optimum medium was formulated with 100 g·L−1 sucrose, 0.02 g·L−1 H3BO3, 0.04 g·L−1 Ca(NO3)2, 150 g·L−1 PEG-4000, 200 g·L−1 MgSO4·7H2O, and 100 g·L−1 KNO3, then adjusted to pH 5.5. The pollen germination was examined in 1 h of the in vitro culture. TTC staining showed satisfactory effect with no significant deviations from the in vitro observation indicating it an applicable indicator for pollen viability. In 24 h of storage at 25 ℃ the pollen viability was 30.48%; and at 4 ℃, it was 26.69% and remained 26.54%–29.05% for 7 d. Conclusion The medium formulation and in vitro culture time as well as the staining method and storage conditions of passion fruit pollens were determined making a rapid and reliable procedure to maximize the pollen germination available. -
Key words:
- Passion fruit /
- pollen viability /
- culture medium /
- in vitro pollen germination /
- staining /
- pollens storage
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表 1 正交因素及水平
Table 1. Orthogonal factors and levers
水平
LevelA.蔗糖
Sucrose /(g·L−1)B.H3BO3/
(g·L−1)C.Ca(NO3)2/
(g·L−1)D.PEG-4000/
(g·L−1)1 0 0 0 0 2 50 0.01 0.01 50 3 100 0.02 0.02 100 4 150 0.03 0.03 150 5 200 0.04 0.04 200 表 2 钦蜜9号花粉离体培养基筛选的L25(54)正交试验设计
Table 2. L25(54) orthogonal experimental design for culture medium of passion fruit pollens
编号
No.因素
Factors萌发率
Germination rate/%花粉管长度
Pollen tube length/μmA B C D 1 1 1 1 1 0 j — 2 1 2 2 2 13.81±1.88 i 158.5±4.03 ab 3 1 3 3 3 48.25±3.12 g 152.92±2.73 ab 4 1 4 4 4 64.50±1.68 f 126.24±5.96 e 5 1 5 5 5 75.53±3.07 bcde 108.29±10.29 f 6 2 1 2 3 69.11±11.13 def 147.43±4.46 bc 7 2 2 3 4 79.85±1.03 abc 132.59±8.86 de 8 2 3 4 5 63.65±4.68 f 109.89±5.34 f 9 2 4 5 1 12.99±2.23 i 150.65±13.17 b 10 2 5 1 2 72.26±1.83 cdef 167.15±4.46 a 11 3 1 3 5 45.95±0.61 g 143.76±7.77 bcd 12 3 2 4 1 0 j — 13 3 3 5 2 76.99±5.37 abcde 126.75±5.77 e 14 3 4 1 3 67.23±7.08 f 134.33±12.72 cde 15 3 5 2 4 85.56±1.82 a 157.36±4.01 ab 16 4 1 4 2 6.5±3.04 ij — 17 4 2 5 3 28.73±17.87 h 124.43±12.31 e 18 4 3 1 4 83.08±3.5 ab 120.2±3.76 ef 19 4 4 2 5 0.27±0.47 j — 20 4 5 3 1 0.18±0.17 j — 21 5 1 5 4 0.54±0.47 j — 22 5 2 1 5 1.03±0.4 j — 23 5 3 2 1 0 j — 24 5 4 3 2 1.66±2.88 j — 25 5 5 4 3 25.94±3.2 h 158.54±9.45 ab k1 40.42 24.42 44.72 2.63 k2 59.57 24.68 33.75 34.24 k3 41.64 54.40 34.53 47.85 k4 23.75 29.33 32.12 62.71 k5 5.83 51.89 38.96 37.29 R 53.74 29.98 12.60 60.08 数据表示为平均值±标准差。同列数据用不同小写字母标识表示在0.05水平差异显著。
Data are represented as mean ± standard deviation; those with different lowercase letters on same column indicate significant differences at P<0.05.表 3 钦蜜9号离体萌发率方差分析结果
Table 3. Variance analysis on in vitro germination rate of Qinmi 9
变异来源
Source of variationIII 类平方和
Class III sum of squares自由度
Degree of freedom均方
Mean squareF 显著性
Significance(P)蔗糖
Sources9986.344 4 2496.586 8.365 0.006** H3BO3 4465.681 4 1116.420 3.740 0.53 Ca(NO3)2 505.625 4 126.406 0.424 0.788 PEG-4000 9836.241 4 2459.06 8.239 0.006** 误差
Error2387.782 8 298.473 **表示在0.01水平差异极显著。
**indicates extremely significant difference at 0.01 level.表 4 不同方法检测的西番莲花粉活力
Table 4. Passion fruit pollen viability detected by different methods
种质
Germplasm染色率
Staining rate/%离体萌发率
In vitro
germination
rate/%I2-IK TTC 亚历山大
Alexandria台农
Tainong83.83±3.76 a 67.69±5.29 a 81.19±2.78 a 74.13±2.89 a 钦蜜9号
Qinmi 981.79±7.75 b 70.29±4.47 b 97.95±1.14 a 79.76±7.80 b 雅蜜
Yami87.85±3.22 b 69.97±5.92 c 95.42±2.16 a 63.71±2.84 c 白花
White Flowers84.32±7.73 b 77.41±6.33bc 97.22±1.89 a 63.7±1.00 c 蓝冠
Blue Crown80.41±3.26 a 64.85±4.41 b 78.50±5.28 a 60.79±4.61 b 香蜜
Xiangmi84.32±7.70 b 63.78±1.11 c 98.75±1.88 a 71.34±6.97 c 数据表示为平均值±标准差,同行数据后不同小写字母表示在0.05水平差异显著。
Data are mean±SD; those with different lowercase letters on same row indicate significant difference at 0.05 level. -
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