|
| Effects of Acid Rain on Germinationand Seedling Growth of Rice |
| |
| DOI：10.16768/j.issn.1004-874X.2022.04.001 |
|
| Hits: 1400 |
| Download times: 777 |
| Abstract: |
| 【Objective】Acid rain affects the growth and development of crops. Exploration of effects of acid rain
on physiological indexes of rice seedlings at the stages of germination and tillering can provide theoretical references for
rice planting in those regions covered by acid rain.【Method】An laboratory experiment was conducted to investigate
physiological indexes of rice germination and growth under stimulated acid rain (SAR) stresses, with the treatments
including pH 3.5, pH 4.0, pH 4.5, pH 5.0 and the control (CK) being pH 6.0.【Result】After incubation for seven days, the
germination rate of rice seeds decreased with the pH decrease of SAR, but the differences were not statistically significant
among treatments. Under low stress of SAR with pH 4.5 and pH 5.0, there were no significant difference in either germination
index or seedling length between treated and CK groups. The seedling length at pH 5.0 was 6.82 (±0.17) cm, a value being
slightly higher than that under CK (6.78 cm± 0.13cm). Under high stress of SAR of pH 3.5 and pH 4.0, the germination index, vigor index and seedling length of rice were significantly lower than those in CK group. The plant height, root length and
chlorophyll content of rice leaves increased first and then decreased during the range of pH 3.5-6.0 of SAR. Some physiological
indexes were promoted under weak acid treatment relative to the CK group. Especially, under the SAR treatments of pH 4.5 and
pH 5.0, the plant height was 23.54 (±0.97) cm and 24.44 (±0.57) cm, respectively, significantly higher than that in CK group
(21.54 cm±1.8 cm). The chlorophyll content was 26.13 (±1.07) SPAD and 27.13 (±0.63) SPAD under the SAR treatments of
pH 4.5 and pH 5.0, and that was significantly higher than that in CK group (23.91±2.00 SPAD). Moreover, the root length was
6.56 (±0.26) cm at the SAR treatment of pH 4.5, which was slightly higher than in CK group (6.50 cm±0.42 cm). In contrast,
high stress of the SAR treatments significantly impressed the physiological and growth indexes of rice, which indicated that
acid rain may exhibit low promoting and high inhibiting effect on rice growth.【Conclusion】High acid rain stress inhibited the
germination and growth of rice, while low concentration acid rain had a certain stimulating effect. |
|
View Full Text
View/Add Comment Download reader |
|
|
|
