4种化学调控剂对烟草幼苗耐弱光性及光合特性的影响
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国家自然科学基金(31460059);


Effects of Four Chemical Regulators on Low Light Tolerance and Photosynthetic Characteristics of Nicotiana tabacum Seedlings
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    摘要:

    弱光环境严重影响烟草植株的生长发育、物质代谢和烟叶品质。该研究通过对烟草幼苗喷施不同浓度的氯化钙[3.0(C1)和6.0(C2)mmol/L CaCl2]、赤霉素[100(G1)和200(G2) mg/L GA3]、水杨酸[1.0(S1)和2.0(S2)mmol/L SA]和多效唑[100(P1)和200(P2)mg/L PP333]进行预处理,研究了这4种化学调控剂预处理对弱光胁迫(80 μmol·m-2·s-1)下烟草幼苗的生长发育、光合性能及耐弱光性的影响,并用隶属函数法进行了综合评价。结果显示:(1)与喷施蒸馏水对照(CK)相比,4种化学调控剂预处理提高了烟草幼苗的单株干重、根系活力、烟叶总叶绿素、脯氨酸含量及光合性能,改善了烟苗的整体素质。(2)当烟苗经弱光胁迫6 d后,与CK相比,4种化学调控剂预处理使烟苗单株干重、根系活力、烟叶总叶绿素含量及其光合性能相对增加,同时降低了烟叶电解质渗透率及MDA含量,延缓了烟苗在弱光胁迫下相对生长速率及干物质积累速率的降低速度,进而增强了烟苗对弱光胁迫的耐受性。(3)4种化学调控剂处理对烟草幼苗的壮苗综合效果为S1 > S2 > C1 > C2 > P2 > G2 > P1 > G1,且SA和CaCl2处理对改善烟苗品质的效果优于GA和PP333;经弱光胁迫6 d后,不同浓度4种化学调控剂预处理对缓解烟草幼苗弱光胁迫的作用大小依次为S1 > C1 > S2 > P1 > P2 > G2 > G1 > C2。研究表明,4种化学调控剂预处理可在一定程度上改善烟苗生长,提高烟苗的成苗素质,并在一定程度上提高弱光胁迫下烟苗的耐弱光性及光合性能,并以1.0 mmol/L SA预处理综合效果最好。

    Abstract:

    Low light intensity environment remarkably affected growth, development and metabolism in tobacco plants and quality of tobacco leaves. In the present study, by spraying different concentrations of calcium chloride [3.0 (C1) and 6.0 (C2) mmol/L CaCl2], gibberellins [100 (G1) and 200 (G2) mg/L GA3] , salicylic acid [1.0 (S1) and 2.0 (S2) mmol/L SA] and paclobutrazol [100 (P1) and 200 (P2) mg/L PP333] on tobacco (Nicotiana tabacum L.) seedlings, we investigated the effects of these pretreatments with the abovementioned four chemical regulators on growth, development, low light tolerance and photosynthetic characteristics of tobacco seedlings under low light intensity stress(80 μmol·m-2·s-1), and carried out comprehensive evaluation by subordinate function. The results showed that: (1) as compared with the control spraying with distilled water (CK), the pretreatments with the four chemical regulators all enhanced dry weight, root vigor, contents of total chlorophyll and proline, and photosynthetic capacity of tobacco seedlings, and improved the seedling quality. (2) After exposed to low light stress for 6 days, as compared with the CK, the pretreated seedlings with the four chemical regulators relatively enhanced dry weight, root vigor, total chlorophyll content and photosynthetic capacity, reduced the electrolyte leakage and MDA level, and delayed the decline level of relative growth rate and dry matter accumulation rate of tobacco seedlings, which in turn enhanced the tolerance of these tobacco seedlings to the low light stress. (3) Comprehensive effects of these treatments with four chemical regulators on improving the quality of tobacco seedlings were S1 > S2 > C1 > C2 > P2 > G2 > P1 > G1, respectively, and SA and CaCl2 pretreatments received better effects than those with spraying GA and PP333. In addition, the relieving effects of these treatments with different concentrations of the four chemical regulators on the low light stress were demonstrated from strong to weak was S1 > C1 > S2 > P1 > P2 > G2 > G1 > C2, respectively, after exposing to low light condition for 6 days. The results indicated that these pretreatments with the four chemical regulators all improved growth and quality of tobacco seedlings, and enhanced their low light tolerance and photosynthetic capacity to some extent, and 1.0 mmol/L SA displayed the optimal effects in this study.

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杨利云,王丽特,徐照丽,等.4种化学调控剂对烟草幼苗耐弱光性及光合特性的影响[J].西北植物学报,2018,38(1):121-130

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  • 在线发布日期: 2018-02-05
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