利用SPAD值與電解質滲漏率評估高溫環境下狼尾草生長變化

Evaluation of growth status of napiergrass under high temperature environment using SPAD values and electrolyte leakage rates

蔡立中(Li-Chung Tsai) ； 李姿蓉(Tzu-Rung Li) ； 鍾萍(Ping Chung)

《畜產研究》 54卷2期 (2021/06) Pp. 140-147

https://doi.org/10.6991/JTLR.202106_54(2).0008

摘要

全球氣候變遷，高溫、乾旱等極端氣候對牧草作物之產量與品質產生不良影響，其問題越來越嚴重。本研究探討國內選育之狼尾草品種於夏季高溫下之生長狀況與SPAD（Soil-Plant Analysis Development）值之相關性，期望能加快選育耐逆境牧草新品種之速度。狼尾草台畜草1至8號（Napiergrass Taishu No. 1 to No. 8, NP cv. TS 1-8）於夏季高溫環境下栽培於不透風溫室內8週，調查其SPAD值與電解質滲漏率，以及株高、產量等農藝性狀表現，進行農藝性狀與SPAD值及電解質滲漏率相關性分析。結果顯示，狼尾草第1週至8週內株高之總改變率以台畜草6號最高。SPAD值以狼尾草台畜草6、7號較高，而4、5號較低；電解質滲漏率在各品種間則無顯著差異。將SPAD值與株高生長率作相關性分析，除與台畜草1號及2號不顯著外，其餘品種則皆為顯著正相關，大部分品種之相關係數為介於0.3至0.7之間之中度相關，而最高者為台畜草4號，其相關係數達0.716。電解質滲漏率與株高生長率相關性之顯著性分析，除台畜草3號以外皆不顯著。本研究之結果，多數狼尾草品種於高溫環境下，SPAD值與株高生長率之間具正相關性，可做為未來新品種選育之參考指標。

關鍵字

高溫 ； 狼尾草 ； SPAD值 ； 電解質滲漏率

並列摘要

The aim of this research was to analyze the growth status of domestic napiergrass and determine the correlation relationship with SPAD values Soil-Plant Analysis Development) under high summer temperature. The napiergrass varieties Taishu No. 1 to No. 8 (NP cv. TS 1 - 8) were planted in the greenhouse in the summer for eight weeks to simulate the environment of summer heat stress. SPAD (Soil-Plant Analysis Development) values, electrolyte leakage (EL) rates, PHL, and forage yield per pot were determined. Results showed that the changing rate of PHL for Taishu No. 6 was the highest. Taishu No. 6 and No. 7 had the highest SPAD values, whereas Taishu No. 4 and No. 5 had the lowest. There was no significant difference in electrolyte leakage rates among the varieties. Pearson correlation analysis showed that there were positive relationships between SPAD values and PHL changing rates; while those between EL and changing rates of PHL were insignificant. The correlation coefficients between SPAD values and PHL changing rates for Taishu No. 3, No. 5, No. 6, No. 7, and No. 8 ranged between 0.3 and 0.7, and the highest was Taishu No. 4 with 0.716. This research showed that the relationship between SPAD value and PHL changing rate was positive. Such information could be applied to future breeding of napiergrass varieties.

並列關鍵字

High temperature ； Napiergrass ； SPAD value ； Electrolyte leakage rate