THE EFFECT OF pH CONDITIONS ON PHYSIOLOGICAL RESPONSE OF SEAGRASS LEAVES Cymodocea rotundata

• Published in: Jurnal Ilmu dan Teknologi Kelautan Tropis
• Main Authors: Andika, Yudho, Kawaroe, Mujizat, Effendi, Hefni, Zamani, Neviaty P.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University 2020
• Subjects: chlorophyll; growth; photosynthesis; seagrass; fotosintesis; klorofil; pertumbuhan; Cara; Ocean acidification
• Online Access: http://journal.ipb.ac.id/index.php/jurnalikt/article/view/21632; https://doi.org/10.29244/jitkt.v12i2.21632

Increased carbon dioxide (CO2) in the atmosphere causes ocean acidification. Acidification becomes a threat to seagrass. Nowadays, one of the challenges that must be faced is to predict the long-term impact of acidification on the physiology of seagrass. This research aims to analyze seagrass Cymodocea rotundata leave physiology responses to pH that consists of chlorophyll-a and b content, photosynthesis rate, and growth rate of seagrass leaf. This research was conducted on September – December 2017 in Marine Habitat Laboratory, Department of Marine Science and Technology, Bogor Agricultural University. The method used a completed randomized design with five repetitions. pH treatment used in this research is low pH (7.55), medium pH (7.78), and control (8.20). The setting of pH value was done by adding CO32-. Chlorophyll-a and b contents, photosynthesis rate, and growth rate on C. rotundata leaf are higher on control pH treatment than medium pH (7.78) and low pH (7.55). ANOVA test shows that only chlorophyll-a is significantly different. The difference pH affects the chlorophyll content of a and b, photosynthesis rate, and leaf growth rate. The low pH of seawater has been shown to inhibit the physiological activity of C. rotundata leaves. Meningkatnya konsentrasi karbondioksida (CO2) di atmosfer dapat menyebabkan asidifikasi laut. Asidifikasi menjadi ancaman bagi lamun. Salah satu tantangan yang harus dihadapi saat ini adalah memprediksi dampak jangka panjang dari asidifikasi laut terhadap fisiologi lamun. Tujuan penelitian ini untuk menganalisis respons fisiologis lamun C. rotundata yang meliputi kandungan klorofil a dan b, laju fotosintesis dan laju pertumbuhan daun lamun. Penelitian dilaksanakan pada bulan September – Desember 2017 di Laboratorium Marine Habitat Departemen Ilmu dan Teknologi Kelautan, Institut Pertanian Bogor. Metode yang digunakan adalah rancangan percobaan acak lengkap 5 pengulangan. Perlakuan pH yang digunakan yaitu pada nilai pH rendah (7,55), menengah (7,78) dan kontrol (8,20). Pengaturan nilai pH dengan cara menambahkan unsur CO32-. Kandungan klorofil a dan b, Laju fotosintesis dan Laju pertumbuhan daun C. rotundata perlakuan pH 8,20 lebih tinggi dibandingkan dengan perlakuan pH 7,78 dan pH 7,55. Uji ANOVA menunjukkan hanya klorofil a yang berbeda signifikan. Perbedaan pH mempengaruhi kandungan klorofil a dan b, laju fotosintesis dan laju pertumbuhan daun. Rendahnya pH air laut terbukti menghambat aktivitas fisiologis daun lamun C. rotundata.